A train 6

A train covers a distance 10km, 20km, and 30km in 50 kmph, 60 kmph and 90 kmph respectively. Find the average speed of the train (in km/h).

Correct answer:

v =  69.2308 km/h

Step-by-step explanation:

a=10 km b=20 km c=30 km  v1=50 km/h v2=60 km/h v3=90 km/h  t1=v1a=5010=51=0.2 h t2=v2b=6020=310.3333 h t3=v3c=9030=310.3333 h  t=t1+t2+t3=0.2+0.3333+0.3333=15130.8667 h s=a+b+c=10+20+30=60 km  v=ts=0.866760=69.2308 km/h



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