Question

a bike reaches point a to b with uniform speed of 30km /have and backs with uniform speed of 20km /h. find average speed ....????

Answer 1

(A)●------------------------------------●(B)

Suppose that the body covered the distance from A to B

Let the distance between those two points be d

Speed1 = 30km/h

Time 1 = distance / speed

= d/30 h

Speed while returning = 20km

Time 2 = d/20 h

Average speed = total distance covered / total time taken

=( d+d) ÷ (d/20) +(d/30)

= 2d ÷ (3d+2d) / 60

= (12)(2)

= 24

So, the average speed was 24 km/h.

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#j@i m@haKAL

Answer 2

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