Two outgoing pipes, where the first one is double the efficiency of the second one. Both pipes together can empty a tank in just 4 hours. What is the pouring capacity of the first pipe in one hour?

Question: Two outgoing pipes, where the first one is double the efficiency of the second one. Both pipes together can empty a tank in just 4 hours. What is the pouring capacity of the first pipe in one hour?

Solution:
Let the second pipe empty the tank in 2X hours.
so, the first pipe can do it in X hours.

total pouring in one hour
= 1/X + 1/2X
= 3/2X

ATQ,
2X/3 = 4
X = 6 hours.

so, the first pipe can pour 1/6 of the tank water in one hour.