Multiple choice

Amatya goes on a countryside trip where he can row a boat 30 km against the current and 45 km with the current in 10 hrs. Also, he can row 45 km against the current and 50 km with the current in 13 hrs. Find the rate of current and the speed of Amatya in still water (in km/hr).

  1. Rate of current- 2.5 km/hr, Speed of Amatya in still water- 5.75 km/hr

  2. Rate of current- 1.29 km/hr, Speed of Amatya in still water- 7.46 km/hr

  3. Rate of current- 1.5 km/hr, Speed of Amatya in still water- 8.5 km/hr

  4. Rate of current- 1.5 km/hr, Speed of Amatya in still water- 10 km/hr

  5. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let x be boat speed and y be current speed. Equations: 30/(x-y) + 45/(x+y) = 10 and 45/(x-y) + 50/(x+y) = 13. Solving this system yields x = 7.46 and y = 1.29 approximately.