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A man covers first half of the distance with a speed of 30 km /hr and the remaining distance with a speed of 70 km /hr .Find the Average speed of the Man in the entire Journey?

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The Brainliest Answer!

according to question x / 2 distance cover in time t1 ,so

x / 2 = 30*t1 ...............(1)

x / 2 distance cover in time t2 ,so

x / 2 = 70*t2.................(2)

average speed = total distance / total time

= x / t ( where t = t1 + t2)

multiply by 7 / 3 in equation (1)

7x / 6 = 70*t1..................(3)

add equation (2) and (3) we get ,

10x / 6 = (t1 + t2)*70

x / (t1 + t2) = 42

hence average speed = 42 Km / hr