Question

a car travel 100 km at a speed of 60 km per hour and return with a speed of 40 km per hour calculate the average speed for the whole journey

Answer 1

while going,
speed = distance/ time
=> time= distance/ speed
=> time= 100/ 60= 10/6= 1.66
now while returning,
speed= distance/ time
=> time = distance/ speed
=> time = 100/40= 10/4= 2.5
again,
average speed= total distance / total time
average speed= (100+100) / (1.66+2.5)
average speed= 200 / 4.16
average speed= 48.07 kmph
HOPE YOU WOULD FIND IT HELPFUL

Answer 2

HOPE THIS HELPS........


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