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A car goes down a certain road at an average speed of 40 km/h and returns along the same road at an average speed of 60 km/h. Calculate the average speed for the round trip.
let d be the one way distance. average speed for round trip= 2d/((d/40)+(d/60))=2*40*60/(40+60)=48 km/h
let the distance between the two points be D
time taken by car to reach the other point is t1=D/40
time taken by car to come back to the initial point is t2=D/60
total distance travelled by car is 2D
average speed = total distance /total time
=2D/(D/40 + D/60)
=48km/h
50 m/s.
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