A heater takes 50 minute to boil a given amount of water, its coil is broken in five equal parts. If one part is used, then how much time it will take to boil the same amount of water using the same source?

Explanation

For heater `H=(V^(2))/(R)xx50`
for one part of coil `H=(V^(2))/(R//5)xxt`
By equation (1) and (2) `(V^(2))/(R)xx50=(V^(2))/(R//5)xxt` t=10 minute