Multiple choice

Brad and Angelina are on a boat. If they travel along the stream, they can travel at the speed of 22 km per hour; but if they travel upstream, they can travel at the speed of 10 km per hour. Find out the ratio of the speed of boat in still water to the speed of stream.

  1. 8 : 3

  2. 14 : 5

  3. 29 : 17

  4. 20 : 9

  5. 10 : 15
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement 1: x - 6 = 0.5x implies x = 12. Sufficient. Statement 2: x + 3 = 3(x - 7) implies x + 3 = 3x - 21, so 2x = 24, x = 12. Sufficient. Both are independently sufficient.

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