Multiple choice

Time taken by a boat to travel a distance upstream to that of downstream in ratio 5-3 If boat can travel 60 km in 4 hrs in downstream then find the speed of stream in kulin

  1. 5

  2. 2

  3. 3

  4. 4

  5. 1
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C Correct answer
AI explanation

Given the ratio of upstream time to downstream time is 5:3, the ratio of upstream speed to downstream speed is the inverse, which is 3:5. Using the formula where the speed of the stream equals 0.5 times the difference of downstream and upstream speeds, we get the stream speed as (5x minus 3x) divided by 2. The downstream speed is given as 60 km divided by 4 hours, which equals 15 km/hr, so 5x equals 15 and x equals 3. Substituting x into the stream speed formula gives 0.5 times (15 minus 9), resulting in a stream speed of 3 km/hr.

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