If 3 taps are opened together a tank is filled in 3 hrs. One of the taps alone can fill it in 10 hrs. and another in 15 hrs. In how many hours will the third tap fill it ?
Select the correct option:
A) 7 hrs. B) 4 hrs. C) 5 hrs. D) 6 hrs. E) 8 hrs.
Part filled by three taps together in 1 hr =1/3 Part filled by one of the tap in 1 hr =1/10 Part filled by another tap in 1 hr =1/15 Part filled by third tap in 1 hr =1/3-(1/0+1/15) =5/30 Therefore the third tap can fill the whole tank in : 30/5 hrs. =6 hrs. Answer : 6 hrs.
<result>D</result>
If 3 taps are opened together a tank is filled in 3 hrs. One of the taps alone can fill it in 10 hrs. and another in 15 hrs. In how many hours will the third tap fill it ?