Others Maths Puzzle

3/5th of a cistern is filled in 1 minute, how much more time will be required to fill the rest of it?

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Others Other Question

A boy started walking from a point towards north. He turned right at right angles. In what direction is he ultimately walking? Given that a, b and c are distinct prime no. greater than 10 and the product of P= 10*a5*b5 and Q= 50*a10*c is Y. Find the no. of common multiples of P and Q which are factors of Y?
option
A. 16
B. 24
C. 36
D. 48