Multiple choice

In still water, the speed of the boat is 36 km/hr. Find out the ratio of downstream speed to the upstream speed of a boat in the river in which the speed of the stream is 4 km/hr.

  1. $3: 5$
  2. $3: 2$
  3. $4: 5$
  4. $5: 4$

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Downstream speed = boat speed + stream speed = 36 + 4 = 40 km/hr. Upstream speed = boat speed - stream speed = 36 - 4 = 32 km/hr. The ratio of downstream speed to upstream speed = 40:32 = 5:4 after dividing both terms by 8.

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