Multiple choice

The ratio of the speed of the boat in still water and that of the current is 3 : 1. What will be the ratio between the time taken to cover a certain distance downstream to upstream एक नाव की स्थिर जल में चाल का धारा की चाल से अनुपात 3 : 1 है। एक निश्चित दूरी को क्रमशः अनुप्रवाह और ऊर्ध्वप्रवाह में तय करने में लगे समय के मध्य अनुपात क्या होगा?

  1. 2 : 1

  2. 1 : 2

  3. 4 : 3

  4. 3 : 1
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let boat speed in still water be 3x and current speed be x. Downstream speed = 3x + x = 4x. Upstream speed = 3x - x = 2x. For the same distance, time is inversely proportional to speed, so ratio of time downstream to time upstream = (1/4x) / (1/2x) = 2x/4x = 1/2 or 1:2. The correct answer is 1:2 (downstream:upstream).

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