Time & Work Mcqs

Q.  wo pipes X and Y fill a tank in 15 hrs. and 20 hrs. respectively, while a third pipe ‘Z’ can empty the full tank in 25 hrs. All the three pipes are opened in the beginning. After 10 hrs. Z is closed. In how much time, will the tank be full ?

a. 12 hrs
b. 14 hrs
c. 16 hrs
d. 18 hrs


ANSWER: See Answer
 
Part filled in 10 hrs.
= 10[1/15+1/20−1/25]=23/30
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