Question

A bus averages 60 mi/h traveling to its destination in the first half of its trip through an expressway and 72 mi/h in the second half traveling through a motorway. What is the bus's average speed for the entire trip rounded to the nearest tenth

Answer 1

The correct answer is 65.5 mi/h

Hope this helps :)

Answer 2

Answer:
`66\ mi/hr`

Explanation:

Given

During first half it travels with a speed of
`v_1=60\ mi/h`

During second half it travels with a speed of
`v_2=72\ mi/h`

Average speed is given by
`=\frac{\text{Distance}}{\text{Total time}}`

suppose t is total time

distance travel in first half
`d=(t)/(2)* 60`

distance travel in Second half
`d=(t)/(2)* 72`

`v_(avg)=((t)/(2)* 60+(t)/(2)* 72)/((t)/(2)+(t)/(2))`

`v_(avg)=(60+72)/(2)=66\ mi/hr`