A) 1 km/hr
B) 2 km/hr
C) 1.5 km/hr
D) 8 km/hr
Correct Answer: A
Solution :
Let the speed of the river current = y km/hr. and the speed of the boat = x km/hr. According to question? \[x+y=\frac{15}{15/4}=4\] ? (1) \[x+y=4\] \[x-y=\frac{5}{5/2}=2\] ? (2) \[x-y=2\] On solving equaitons (1) and (2) \[x=3\,\,km/hr\] \[y=1\,\,km/hr\] Hence, the speed of the river current is 1 km/hr.You need to login to perform this action.
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