Multiple choice

A boat running upstream takes 6 hours 30 minutes to cover a certain distance and it takes 3 hours 30 minutes less to cover the same distance running downstream. The ratio of speed downstream to the speed upstream is

  1. $13:6$
  2. $19:7$
  3. $17:8$
  4. $11:5$
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A Correct answer
Explanation

Upstream time = 6.5 hours, downstream time = 3 hours (6.5 - 3.5). Distance same, so speed downstream: speed upstream = time upstream: time downstream = 6.5:3 = 13:6. Downstream speed = boat + current, upstream = boat - current. Ratio 13:6 matches this relationship.

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