Đổi 2 giờ 18 phút =138 phút
Từng mất số thời gian về đến nhà là:138+25=163(phút)
D/S:163 phút
Đổi 2 giờ 18 phút = 138 phút
Tùng mất số thời gian vầ đến nhà là :
138 + 25 = 163 phút
Đáp số : 163 phút
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?
both A and B province 105 km apart. motnguoi at 8 hours 15 minutes cycling from A to B at the same time a car from B to A. the two met at 9 hours 30 minutes
Asian. the velocity of each car knows the speed of each car knows the speed of the automobile velocity 5x bicycle
b. A confluence how many kilometers?
Mr. Bao goes from home to the stadium and the distance is 140 km. He rode his bicycle for 1 hour and 20 minutes and then proceeded by car 2 hours to arrive. Knowing the speed of cars folds the motor speed 4 times. Calculate the speed of each vehicle.
sson 1. Lan in the apartment number? Lan house is in an 8 storey house, each floor has 8 apartments. One day, the class asked Lan: "What is your house in the apartment?" "Ask me some questions, I will answer all your questions, but just say" yes "or" no. "Through these questions you try to figure out how many in the apartment" Huy said: "I will ask, are you in the apartment number 1, number 2, ..., No. 63. So with most 63 questions you will know which apartment you. You say, "I only need 14 questions, 7 sentences enough to know what floor you are on and 7 you can know exactly what you are in the apartment." Dear children, I have to ask several times to know. How are you Lan in the apartment?
Lesson 2. Game together across the bridge. Four people need to cross a bridge. Because of the weak demand, each time we go not more than two people, and because it is dark, we have to take the light. Four people walk differently, crossing the bridge with corresponding time of 10 minutes, 5 minutes, 2 minutes and 1 minute. Since there is only one lamp, each passage must be carried back to the next person. When two people go together, cross the bridge with a slower time. The following example is a way to go: - 10 minutes to go with people 5 minutes to bridge, 10 minutes to take. - 5 minutes to take the lamp back, take 5 minutes. - 5 minutes to go with people 2 minutes through the bridge, It takes 5 minutes. - 2 minutes to take the lamp back, take 2 minutes. - 2 minutes with people 1 minute over the bridge, take 2 minutes. Total time is 10 + 5 + 5 + 2 + 2 = 24 minutes. Let's try to get away with a little less time as possible, and if less than 19 minutes is great
Lesson 3. Cashmere. Mallard buys 27 apples that are identical in size and volume. However, the salesman said that of the apples on the right is a slightly lighter weight. You use a table scales on both sides to find the apple that light. The minimum number of weighs required. Let's help you find that little apple. If they find that fruit after less than 5 weightings, then it is good.
Two men went first person to go from A to B
The second person to go from A to B. After 1 hour 20 minutes, then meet. Count V1 know
It takes 5 minutes to fry a pancake. One side of the pancake takes 3 minutes to fry and the other side takes only 2 minutes. Two pancakes can be placed on the frying pan at a time. What is the shortest time to fry all five pancakes???
Question 8. A staircase has 26 steps. Tung and Bao count the steps; one from the bottom to the top and the other from the top to the bottom. They meet at one step which Tung indicates as the 12th. At which number does Bao indicate this step?
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
after school, Lan walks back home at speed of 4km/h. After 15 minutes,her father picks her up and gets back home at speed of 40km/h.How long is it from Lan's house school? Given that her father takes her bach home in 6 minutes.
David walks to a shoppingmall tomeet his friend.If he walks at a speed of 30 meters per minutes,he will be late 4 minutes.If he speeds up to 40 meters perminutes,he will reach the shopping mall 3 minutes nefore the appoint time.How far away is the shopping mall from his place?
