A car travels a distance of 40 km at a uniform speed of 40km/h and returns back at a speed of 60km/h. Calculate the average speed of the entire journ
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Answer: 48km/h
Explanation:
Speed from A to B - 40km/h
Speed from B to A - 60km/h
Let distance from A to B be x(km)
Therefore,
Time from A to B- Distance/Speed
= x/40(hrs)
Time from B to A- Distance/speed
= x/60(hrs)
Average speed- Total Distance/Total Time
= x+x/x/40+x/60
= 2x/6x+4x/240
= 2x/10x/240
= 2x/x/24
= 2x*24/x
= 2*24
= 48 km/h
Hope this helps....
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