Jaidev takes 11/5 minutes to walk across the school ground. Rahul takes 7/4 minutes to do same. Who takes less time and by what fraction?

Time taken by jaidev =11/5 minutes
Time taken by Rahul =7/4 minutes
Difference =11/5-7/4=11×4-7×5/20 [ L.C.M. of 5 and 4 is 20]
= 44-35/20 = 9/20 minutes
Thus, Rahul takes less time, which is 9/20 minutes.

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