Question

Riya rides a bike at an average speed of 50 kmph and reaches her destination in 6 hours. Himani covers the same distance in 5 hrs. If Riya increases her average speed by 10 kmph and Himani increases her average speed by 20 kmph, what would be the difference in their time taken to reach destination?

A 55 min
B 48 min
C 50 min
D 75 min
E none of these
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