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Pipes A B and C can fill a tank in 30h...

This question belongs to Arithmetic Ability Pipes And Cistern
Pipes and Cistern
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Pipes A, B and C can fill a tank in 30h, 40h and 60h respectively. Pipes A, B and C are opened at 7 a.m., 8 a.m., and 10 a.m., respectively on the same day. When will the tank be full?

Answer & Solution
Correct Answer: Option B
Pipes and Cistern mcq question image
Till 10 am
3A + 2B + (A + B + C)t = 120
3 × 4 + 2 × 3 + (4 + 3 + 2)t = 120
9t = 120 - 18
t = $$\frac{{102}}{9}$$
t = $$11\frac{1}{3}$$
t = 11 hr 20 min
10 am + 11:20 = 21:20 = 9:20 pm
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