car travels 120 km A to B at 30 km per hour but returns the same distance of 40 km second per hour what is the average speed for the round trip
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distance=120km
speed1 =30
speed2= 40
time at 1st interval =120/30=4h
at 2nd interval = 120/40 = 3h
average speed= (120+120)/(4+3) = 240/7 km/h
speed1 =30
speed2= 40
time at 1st interval =120/30=4h
at 2nd interval = 120/40 = 3h
average speed= (120+120)/(4+3) = 240/7 km/h
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