IBPS Government Jobs Exams Numerical Ability Pipes and Cistern

Two pipe A and B can fill the tank in 30 min and 36 min respectively. Both pipes start together but due to some reason they work with of their 2/3 rd and 3/5 th efficiency respectively. After sometimes the problem is solved and remaining tank is filled in 10 min. Find out the total time taken by pipes to fill the tank?
A)8 min B)12 min C)10 min D)9 min E)20 min

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IBPS Other Question

A boat takes 105/2 hours to travel downstream from A to B and upstream from B to A. If the speed of the boat in still water is 17.5 kmph and the speed of current is 1.5 kmph. What is distance between A and B ?
A) 300 km B) 320 km C) 234 km D) 456 km E) 430 km Ratio of time taken by three pipes A, B and C to fill or empty the tank is 10:15:18. But A and B are inlet pipe and C is a outlet pipe. All pipe together can fill the tank in 18 hours. Find out the time taken by pipe A and B together to fill the tank?
A)15 hours B)18 hours C)12 hours D)14 hours E)16 hours