A car travels from Mumbai to Pune at a average speed of 50 km/hr and back from

Pune to Mumbai at an average speed of 75 km/hr. If the distance from Mumbai to
Pune is 150 km, what is the average speed for the round trip from Mumbai to
Pune and back?

from Mumbai to Pune:

S = 50km/hr

D = 150km

T = ?

S = D/T

50 = 150/T

T = 150/50 = 3hrs

from Pune to Mumbai:

S = 75km/hr

D = 150km

T = ?

S = D/T

75 = 150/T

T = 150/75 = 2hrs

average speed = total distance/total time

  = 150 + 150/ 3 + 2 = 300/5 = 60km/hr

thus, average speed = 60km/hr.

hope this helps!!!!!

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