Question

A boat goes 6 km an hour in still water, but takes thrice as much time in going the same distance against the current. The speed of the current (in km/hour) is :

• A. 4
• B. 3
• C. 2
• D. 5

Answer 1

Answer:

A. 4

Solution:

Let the speed of the current be x kmph.

According to the question,

$6 km/hr=3(6-x)$

$\frac{6}{6-x}=3$

$18-3x = 6$

$3x = 18-6$

$x=\frac{12}{3}=4 kmph$

Speed of current = 4kmph.