self Maths Puzzle

2 pipes are running conitinuouslt to fill a tank. The 1st pipe can fill the tank in 5 hours by itself and the second one by itself could have filled 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 hours
b) 20 hours
c) 25 hours
d) 40hours
e) 30 hours

Read Solution (Total 2)

self Other Question

Today is friday.After 62 days it will be? (a+bc)+(de+f)(a+bc)'solve the expression??