A, the distance between the two places is 162 kilometers. There is a truck in a, the speed is 48 kilometers per hour. There is a bus in B, the speed is 60 kilometers per hour (1) If the two vehicles are facing each other at the same time, the trucks are delayed for half an hour on the road. How long can they meet? (2) If the two vehicles are facing each other and starting at the same time, how long will it take for the two vehicles to be 54 km apart?

A, the distance between the two places is 162 kilometers. There is a truck in a, the speed is 48 kilometers per hour. There is a bus in B, the speed is 60 kilometers per hour (1) If the two vehicles are facing each other at the same time, the trucks are delayed for half an hour on the road. How long can they meet? (2) If the two vehicles are facing each other and starting at the same time, how long will it take for the two vehicles to be 54 km apart?

(1) (162-60 × 0.5) / (48 + 60) + 0.5 = 11 / 9 + 1 / 2 = 31 / 18 hours
(2) (162-54) / (48 + 60) = 1 hour

The distance between a and B is 385km. A car runs 165km in three hours. At this speed, how many hours does it take to walk from a city to B city?

385：X= 165：3
165X= 3* 385
165X= 1155
X=7

How many hours can a car return to a place if its speed increases by 20% when it goes from a place to B and travels 60 kilometers per hour in three hours?

60 × [60 × (1 + 20%)] = 180 × 72 = 2.5 (hours); a: you can return to Jiadi in 2.5 hours

How many hours can a car return to a place if its speed increases by 20% when it goes from a place to B and travels 60 kilometers per hour in three hours?

60 × [60 × (1 + 20%)] = 180 × 72 = 2.5 (hours); a: you can return to Jiadi in 2.5 hours