A tank is filled in 10 hours by three pipes A, B and C. Pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?
Choose the correct choice from the following answers:
A) 70 hours B) 30 hours C) 35 hours D) 50 hours E) 40 hours
Efficiency of pipes A,B,C =1:2:4   Therefore, in 10 hours, part of the tank filled by A =17   Therefore, pipe A alone requires 10×7=70 hours to fill the tank.   70 hoursnswer: Option 70 hours
<result>A</result>
A tank is filled in 10 hours by three pipes A, B and C. Pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?