Question

The speed of a boat in still water is $15 \, km \, h^{- 1}$ and the rate of current is $3 \, km \, h^{- 1}$ . The distance travelled downstream in $12$ minutes is

• A. $\text{1.2}km$
• B. $\text{1.8}km$
• C. $\text{2.4}km$
• D. $\text{3.6}km$

Answer 1

Answer: (D)

Speed downstream $=\left(\right.15 \, + \, 3\left.\right)kmph=18kmph$
Distance travelled $=\left(18 \times \frac{12}{60}\right)km=\text{3.6}km$