Question

A man travelled a distance of 61 miles in 7 hours. He covered a part of the distance at a speed of 8 miles/ hr and the remaining at a speed of 10 miles/ hr. How long did he travel at 8 miles/ hr?​

Answer 1

4.5 hours

Explanation:

8t + 10(7-t) = 61

8t +70-10t=61

-2t = 61-70

-2t= -9

t = -9/-2

t = 4.5