alleryPipes A and B can fill a tank in X minutes and 6 minutes respectively. Together they fill it in 1.5 minutes. Find X.
A1 minute
B4 minutes
C5 minutes
D2 minutes
Answer & Solution
Correct answer: D. 2 minutes
1. Combined rate: 1/X + 1/6 = 1/1.5 = 2/3.
2. 1/X = 2/3 - 1/6 = 4/6 - 1/6 = 3/6 = 1/2.
3. So X = 2 minutes.
_Source: RRB Group D CEN-02/2018 PYQ, Q.20._
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