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Distanc e between two stations A and B is 778 km. A train covers the journey from A to B at 84 km per hour and returns back to A with a uniform speed of 56km per hour. Find the average speed of the train during the whole journey?
A. 67.0 km /hr
B. 67.2 km /hr
C. 69.0 km /hr
D. 69.2 km /hr
Read Solution (Total 1)
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- let us assume A =x,B=y
distance between two stations a and b=2*x*y= 2xy
but,train cover a journey of
A=56 km/hr B=84 km/hr
Average speed =[2xy/x+y]km/hr
= 2*84*56/(84+56) km/hr
=[2*84*56/140] km/hr
= 67.2 km/hr - 11 years agoHelpfull: Yes(0) No(0)
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