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What is the probability of getting 53 sundays in a leap year???

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TCS Other Question

Two taps are running continuously to fill a tank. The first tap could have filled it in 5 hours by itself and the second one by itself could have filled it in 20 hours. But the operator failed to realize that there was a leak in the tank from the beginning which caused a delay of one hour in the filling of the tank. Find the time in which the leak would empty a filled tank?
option
a)15
b) 20
c) 25
d) 40
Total no.of 5's from 114115......371372????