A tank can be filled in 30 minutes by 20 pumps. If five pumps go out of order, what time will be taken by the remaining pumps?
Explanation:
We know,
Time ∝ 1/no. of pumps
∴ Time × (Number of pumps) = constant.
⇒ 20 × 30 = 15 × x
⇒ x = 20 × 30/15 = 40 mins
Hence, option (a).
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