on a 120 kilometre track A train travels the first 30 km at a uniform speed of 30 km per hour how fast The train travels the next 90 km so to average 60 km per hour for the entire trip
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S1= 30 km
V1= 30 km/hr
T1=30/30=1 hr
S2=90 km
T2= 2-1=1 hr
V2=S2/T2=90/1=90 km/hr
Total distance = 120 km
average speed = 60 km/hr
average speed = total distance/
total time
60= 120/T
T=120/60
T= 2 hr
Hope it helps you.
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