A man traves Delhi to Mumbai at a speed of 60km/hr and come back at a speed of 70km/hr. what is the average speed?
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Answer:
Step-by-step explanation:
from delhi to mumbai
speed=60km/hr
time=d/60 hrs(because time = distance/speed)
from mumbai to delhi
speed=70km/hr
time=d/70 hrs
solution
total distance travelled=2d kms
total time taken=d/60+d/70 hrs
avg speed=total distance/total time
so calculate this by using above formula
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