A) 5 hours
B) 6 hours 15 min
C) 6 hours 30 min
D) 6 hours 50 min
Correct Answer: D
Solution :
[d] Let speed of boat = 36x km/h Speed of current = 5x km/h \[\therefore\] \[(36x+5x)\times \frac{310}{60}=\left( 36x-5x \right)\times t\] \[t=\frac{41\times 310}{60\times 31}=\frac{41}{6}=6H\,\,50\,\min\]You need to login to perform this action.
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