A pipe fills a pool in 3.5 hours. If the flow of water is changed so that the pipe's rate is halved, then how long will it take for the pipe to fill 2/3 of the pool?	Choose the correct choice from the following.
A) 4 hours and 40 minutes  B) 3 hours and 10 minutes  C) 2 hours and 20 minutes  D) 7 hours  E) 2/21 hours
A pipe takes 3.5 hrs to fill the tank. So when rate is reduced to half it will take 7 hrs to fill the tank.   so time time taken to fill 2/3rd tank capacity is given by   7*2/3=4 hrs 40min   4 hours and 40 minutesNSWER:4 hours and 40 minutes
<result>A</result>
A pipe fills a pool in 3.5 hours. If the flow of water is changed so that the pipe's rate is halved, then how long will it take for the pipe to fill 2/3 of the pool?