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 = 225 tonnes |
\[\therefore \]Water admits in 60 min \[=\frac{225}{55}\times 60\] |
\[=\frac{1350}{55}\] tonnes |
After pumps, water contains in boat in 60 min |
\[=\frac{1350}{55}-12=\frac{690}{55}\]tonnes |
\[\because \]\[\frac{690}{55}\]tonnes water contam in boat in 1 hr |
\[\therefore \] 92 tonnes water contain in boat in |
\[\frac{55}{690}\times 92=\frac{22}{3}\] |
Required speed \[=\frac{77}{\frac{22}{3}}=\frac{231}{22}=10.5\,\,kim/h\] |
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