Question

Mike traveled to Greensboro by car. Going there took 6 hours, and the return trip was four hours. Mike averaged a speed of 81 miles while returning. Find the average of the trip there.

Answer 1

Answer: 64.8 mph

Explanation:

Given

Arriving time is 6 hours

return time is 4 hours

The average speed of returning 81 mph

Distance traveled while returning

`\Rightarrow d=81* 4=324\ miles`

the average speed of the entire trip is

`\Rightarrow v_(avg)=(2* 324)/(6+4)=(648)/(10)=64.8\ mph`