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2014-08-19T18:33:09+05:30

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The traveling time with an average speed of 50 km/h = 100 / 50 = 2hours

traveling time for first 60 km = 60 / 45 = 1.33 hours

motor cyclist has to cover the remaining distance 40 km in (2 - 1.33) hours 
           =  0.67 hours.

So motor cyclist's speed for remaining journey:  40 / 0.67 =  60 km / hr

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