Hung 2km from the house. Hung school at 16 hours 30 minutes and walk home with a velocity of 2.5 km / hour, and then announced Hung motorcyclists from 37,5km velocity / time to pick Hung. Meet Hung Q. What time?
Nhà Hùng cach trường 2 km.Hùng tan học lúc 16 giờ 30 phút và đi bộ về nhà với vận tốc 2,5 km/giờ , cùng lúc đó bố của Hùng đi xe máy từ nhà với vận tốc 37,5km/giờ để đón Hùng .Hỏi Hùng gặp bố lúc mấy giờ?
There are two cars running from the place A to the place B. The first car 's velocity is v1 km/h in the first half of the street and v2 km/h in the second half of the street. The second car 's velocity is v1 km/h in the first half of the time that the second car runs from A to B and v2km/h in the second half of the time that the second car runs from A to B. Which one of two cars will be in the place B the first??? ( have two case like v1=v2 and v1 khác v2 )
At 8:24 AM,a motorbike travels from A to B at a speed of 36 km/h.At 9:00 AM,a car travels from A to B at a speed of 54km/h and is able to catch up with the motorbike at B.Find the distance from A to B in kilometers.
Dịch : Lúc 8 giờ 24 phút,một chiếc xe máy đi từ A đến B với vận tốc 36 km/h.Lúc 9 giờ,một chiếc ô tô đi từ A đến B với vận tốc 54 km/h và đuổi kịp xe máy tại B.Quãng đường AB dài bao nhiêu km ?
Giải : Xe máy đi trước ô tô : 9 giờ - 8 giờ 24 phút = 36 phút = 0,6 giờ
Khi ô tô khởi hành thì 2 xe cách nhau : 36 x 0,6 = 21,6 (km)
Hiệu vận tốc 2 xe là : 54 - 36 = 18 (km/h)
Ô tô đuổi kịp xe máy sau : 21,6 : 18 = 1,2 (giờ)
Quãng đường AB là : 54 x 1,2 = 64,8 (km)
Thời gian xe máy đi trước ô tô là:
9 giờ - 8 giờ 24 phút = 36( phút )
Đổi : 36 phút = 0,6 giờ
Khi ô tô khởi hành thì 2 xe cách nhau là:
36 x 0,6 = 21,6 ( km )
Sau mỗi giờ , ô tô đi hơn xe máy là:
54 - 36 = 18 ( km )
Thời gian ô tô đuổi kịp xe máy là:
21,6 : 18 = 1,2 ( giờ )
Quãng đường AB dài là:
54 x 1,2 = 64,8 ( km )
Đáp số: 64,8 km
Two canoes at A go to B or C (A is between B and C). The convention from A to B is positive, the direction from A to C is negative. Ask canoes to go at speeds of 10km / h and -12km / h then two hours canoe how many meters apart.
Solving math problems in English and Vietnamese
Hurry up man
At the end on 12hours tomorrow
At 7 hours and 30 minutes, an automobile going from A to B, to 11 hours, the cars arrive. The speed of the cars is 60km / h. Calculate the distance AB
Are you sure about ' cars' in the problem. However, I can show you in case the problem can be true.
The car spends 11h-7h30min= 3h30min to go from A to B.
Since the speed of car is 60 km/h.
Applying the operation s=vt, we have
The distance AB=s= 60 × 3h30min= 210km.
Question 1
Bob drove from City P to City Q. He traveled the first 36km at an average speed of 54km/h. He traveled the remaining 96km at a average speed of 72km/h. Find his average speed for the whole trip.
Answer: km/h.
Question 2
John drove from Town A to Town B in 5 hours. His average speed for the first 3.5 hours was 64km/h. His average speed for the last 1.5 hours was 60km/h. What was the total distance he traveled?
Answer: km.
Question 3
A car traveled at 50km/h for 2 hours and at 60km/h for 3 hours. What is the car’s average speed?
Answer: km/h
Question 1:66 km/h
Question 2:314 km
Question 3:200/9 km/h
Question 1:66 km/h
Question 2:314 km
Question 3:56 km/h
Two man depart at once , the first man to go from A to B , 2nd person goes from B to A . The first person to B , then turned right , the 2nd to A , the right back . They met 1st in C from A is 10 km and the 2nd meeting at D is 8 km from B . Caltulate the distance AB ?
các bạn làm giúp mình nhá !
Mr.Joseph drives car from A to B at a constant speed. If the speed of the car is increased by 20%, it takes him one hour less than the usual time. If he drives at the constant speed for the first 100km before increasing the speed by 30%, it also takes him one hour less than the usual. The distance of AB is ..........km.
Gọi S là quãng đường
v là vận tốc
t là thời gian Mr.J đi thường ngày
=>\(\dfrac{S}{120\%v}=t-1\)
\(\dfrac{100}{v}+\dfrac{S-100}{130\%v}=t-1\)
=>\(\dfrac{S}{120\%v}=\dfrac{100}{v}+\dfrac{S-100}{130\%v}\)
<=>\(\dfrac{130S}{156v}=\dfrac{15600+120S-12000}{156v}\)
<=>\(10S=3600\)
<=>\(S=360\)
Xong rầu đó khỏi cảm ơn 
Điền từ vào chỗ trống :
I had a normal day yesterday .I woke (1)____ at 7.30 , Jumped into the shower , and dressed .As usual , I (2)____ to the morning news on the radio at the same time .I didn't (3)_____ breakfast .I'm never hungry in the morning .I (4)____ two cups of strong ,black coffee for about 3 hours .
At noon , I realized I was late for an interview with an actor , so I drove very(5)____ to the TV station . I got to the TV station on time , but the actor didn't come . I (6)____ a sandwich while I waited (7) ____ him and talked to some other journalists about the events of the day .
Then I (8)____ my mother to say " HAPPY BIRTHDAY " From there I got in to my car and went (9)___ the newspaper office where I work . I arrive at the office (10)___ 1.45 - late for a 1.30 meeting .
I had a normal day yesterday .I woke (1)__up__ at 7.30 , Jumped into the shower , and dressed .As usual , I (2)__listened__ to the morning news on the radio at the same time .I didn't (3)__eat___ breakfast .I'm never hungry in the morning .I (4)__drank__ two cups of strong ,black coffee for about 3 hours .
At noon , I realized I was late for an interview with an actor , so I drove very(5)__fast__ to the TV station . I got to the TV station on time , but the actor didn't come . I (6)__was eating_ a sandwich while I waited (7) __for__ him and talked to some other journalists about the events of the day .
Then I (8)__called__ my mother to say " HAPPY BIRTHDAY " From there I got in to my car and went (9)_to__ the newspaper office where I work . I arrive at the office (10)__at_ 1.45 - late for a 1.30 meeting .
