A man travels a distance of 10 miles at 20 miles per hour and returns over the same route at 30 miles per hour. What is his average speed for the round trip in miles per hour?
Created: 6 years ago |
Updated: 2 years ago
best des
let, x = 20 miles/hr
y = 30 miles/hr
we know,
average speed = 2xy/(x + y)
= 2*20*30/(20 + 30)
= 1200/50
= 24 miles/hr (ans)
Md Azizur Rahman
Founder of Satt
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