CE Physics - Position&Movement

Question

A car travels from town A to town B. It first moves at a speed of 60km/h for 20 minutes and then at 80km/h for the rest of time. What is the car’s average speed if the distance between town A and town B is 60km ?

更新:

Please explain the answer. The answer can use Chinese or English.

Answer 1

最愛解答

A car travels from town A to town B. It first moves at a speed

of 60km/h for 20 minutes and then at 80km/h for the rest of time. What

is the car’s average speed if the distance between town A and town B is

60km ?

Time used for finished the way

= (60-60/3)/80 + 1/3

= 5/6 hrs

Average speed

= 60/(5/6)

= 72 km/h

資料來源： Hope can help you^^”