Question

Two boats A and B start towards each other from two places, 108 km apart. Speed of the boat A and B in still water are 12km/hr and 15km/hr respectively. If A proceeds down and B up the stream, they will meet after.

• A. 4.5 hours
• B. 4 hours
• C. 5.4 hours
• D. 6 hours

Answer 1

Answer:

B. 4 hours

Let the speed of the stream be x kmph and both the boats meet after t hours

According to the question ,

(12 + x) t + (15 – x ) t = 108

12t + 15t = 108

27t = 108

$t=\frac{108}{27}$

$t=4hours$