Question
Mathematics Question on Time and Work
It takes 30 minutes to empty a half-full tank by draining it at a constant rate. It is decided to simultaneously pump water into the half-full tank while draining it. What is the rate at which water has to be pumped in so that it gets filled in 10 minutes ?
A
4 times the draining rate
B
3 times the draining rate
C
2.5 times the draining rate
D
2 times the draining rate
Answer
4 times the draining rate
Explanation
Solution
The correct option is (A) : 4 times the draining rate.