SOLUTION: The distance between Mumbai and Poona is 180 km. He a car goes mumbai to poona at the speed of 70 km per hour. And again car returns from poona to mumbai at the speed of 60 km per

Question 818459: The distance between Mumbai and Poona is 180 km. He a car goes mumbai to poona at the speed of 70 km per hour. And again car returns from poona to mumbai at the speed of 60 km per hour. What is the average speed of the car?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
s = d / t
t = d / s
---
outbound:
ta = 180 / 70
ta = 18/7 hours
---
return:
tb = 180 / 60
tb = 18/6 hours
---
total time:
T = ta + tb
T = 18/7 + 18/6
T = 6(18/42) + 7(18/42)
T = (108/42) + (126/42)
T = (234/42)
T = 5.5714 hours
---
average speed:
s = d / t
s = 360/(234/42)
s = 64.615 kph
---
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