a car covers first 40km/hr at 60km/hr and next 60km/hr at 40km/hr find his average speed of the whole journey
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answer:
600/13
Step-by-step explanation:
average speed = total distance/total time
total distance 40+60=100
time for first travel= 40/60=2/3
time for second travel =60/40=3/2
total time = 2/3+3/2= 13/6
avg. speed= 100/(13/6)= 600/13
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