Question

Farah is enjoying a boat ride with Kaira. Farah can row the boat at a speed of 12 mph in still water. The speed of the stream is 2 mph.

Farah rows her boat along the stream toward the dock, which is 28 miles away. How much time will she take to reach the dock?

• A. 2.5 h
• B. 3 h
• C. 2 h
• D. 1 h

Answer 1

The correct option is C 2 h

Speed of boat = 12 mph
Speed of stream = 2 mph

Farah is moving downstream as she is moving with the stream or moving in the direction in which the stream flows.

The formula for downstream speed is:

Downstream speed = Speed of boat + Speed of stream

Here,
Downstream speed = 12 + 2 = 14 mph

We know,

$Speed=\frac{Distance}{Time}$

$Time=\frac{Distance}{Downstreamspeed}$

$\Rightarrow Time=\frac{28}{14}$

$\Rightarrow Time=2h$

Thus, Farah will take 2 hours to reach the dock, which is 28 miles away.