A car travels 120 kilometers in 2 hours, 180 kilometers from a to B. with the same speed, the car takes () hours to travel back and forth

A car travels 120 kilometers in 2 hours, 180 kilometers from a to B. with the same speed, the car takes () hours to travel back and forth

2 hours = 120 kilometers, 1 hour = 60 kilometers, 180 kilometers = 60 × 3 = 180 kilometers, 3 hours to and fro, 3 × 2 = 6 hours. Understand?

A car is driven from place a to place B to deliver goods. It travels 45 kilometers per hour, arrives in 3 / 2 hours, and returns at 6 / 5 of the original speed. How many hours can I return?
General solution: 45 × 3 / 2 ÷ (45 × 6 / 5) = 1 1 / 4 hours, more ingenious solution! Winter vacation homework

3 / 2 △ 6 / 5 = 5 / 4 = 1 and 1 / 4 (hours)

A car delivers goods from place a to place B, 45 kilometers per hour, three fourths of an hour. When returning, the speed is five sixths of the original, and it will return in a few hours

Hello
45 × 3 / 4 (45 × 5 / 6)
=45 × 3 / 4 ／ 45 ／ 5 / 6
=3 / 4 ／ 5 / 6
=9 out of 10 (hours)
A: 9 out of 10 hours