10 pipes are required to fill a tank in 1 hour 40 minutes. If we use 8 such pipes, the time it will take to fill the tank is ______?
- 115 minutes
- 125 minutes
- 105 minutes
- None of these
Explanation
Given:
10 pipes fill the tank in 1 hour 40 minutes = 100 minutes
Let's find the rate of 1 pipe:
Rate of 10 pipes = 1 tank / 100 minutes
Rate of 1 pipe = 1 tank / (10 × 100) minutes
= 1 tank / 1000 minutes
Rate of 8 pipes = 8 tanks / 1000 minutes
= 1 tank / (1000 / 8) minutes
= 1 tank / 125 minutes
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