A) 10.5 km/h
B) 14.5 km/h
C) 9.75 km/h
D) 13 km/h
Correct Answer: A
Solution :
\[\because \]Water admits in 5.5 min= 2.25 tones \[\therefore \]Water admits in 60 min \[=\frac{2.25}{55}\times 60=\frac{1350}{55}\]tones After pumps, water contains in boat in 60 min \[=\frac{1350}{55}-12=\frac{690}{55}\]tones \[\because \]\[\frac{690}{55}\]tones water contain in boat in 1 h \[\therefore \]92 tones water contain in boat in \[\frac{55}{690}\times 92=\frac{22}{3}\] \[\therefore \]Required Speed\[=\frac{\frac{77}{22}}{3}=\frac{231}{22}=10.5\,\,\text{km/h}\]You need to login to perform this action.
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