10. Distance between two stations A and B is 778km. A train covers the journey from A to B at 84km per hour and returns back to A with a uniform speed of 56km per hour. Find the average speed of train during the whole journey.
A.60 km/hr
B.30.5 km/hr
C.57 km/hr
D.67.2 km/hr
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Answer - (D)
Solution:
Average speed=(2xyx+y)km/hr
=(2*84*5684+56) km/hr
=(2*84*56140)km/hr
= 67.2km/hr.
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Title : Averages Q10
Description : 10. Distance between two stations A and B is 778km. A train covers the journey from A to B at 84km per hour and returns back to A wit...
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