a train goes from p to q with u km/h q to r with 3u km/h and qr= 2pq . train returns from r to p with u/2 km/h . find his average speed throughout the journey
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Answered by
1
Answer:
9u/10
Step-by-step explanation:
avg speed=distance/time
say,pq=d,qr=2d
distance=pq+qr=d+2d=3d
say,to cover pq distance=t1
say, to cover qr distance=t2
then cover the distance pq time required=d/u(v=x/t,where v=velocity,x=distance,t=time)
t2=3d/u,t3=t1+t2=2d/u
avg speed=distance/time
=3d/(d/3u+d/u+2d/u)=9u/10
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Step-by-step explanation:
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