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Question

Two taps 'A' and 'B' can fill a water reservoir in 8 and 6 hours respectively, A third tap 'C' can empty the tank completely in 24 hours.How long would it take to fill the empty tank when all the taps are open?
  1. 4 hours
  2. 5 hours
  3. 6 hours
  4. 3 hours

A
5 hours
B
3 hours
C
4 hours
D
6 hours
Solution
Verified by Toppr

Tap A can fill in 8 hr. B in 6 hr, C can empty reservoir in 24 hr
All 3 can fill reservoir in 1 hr
=18+16124=6+8248=1248

All three can fill whole reservoir in 4812i.e. 4 hr.

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