Multiple choice

Sweta swims a certain distance down stream in 4 hours and she returns the same distance upstream in 6 hours. If the speed of current is 2 kmph, then find her speed of swimming upstream the current. श्वेता एक निश्चित दूरी धारा के अनुप्रवाह 4 घण्टे में तय करती है और वह उसी दूरी को धारा के ऊर्ध्वप्रवाह 6 घंटे में तय करती है। यदि धारा की चाल 2 किमी/घंटा है, तो धारा के ऊर्ध्वप्रवाह उसकी चाल ज्ञात कीजिए।

  1. 10 kmph/किमी/घंटा

  2. 8 kmph/किमी/घंटा

  3. 6 kmph/किमी/घंटा

  4. 12 kmph/किमी/घंटा
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let swimming speed in still water be v kmph. Downstream speed = v+2, upstream speed = v-2. Distance is same, so 4(v+2) = 6(v-2). Solving: 4v+8 = 6v-12, so 2v = 20, giving v = 10 kmph. The question asks for upstream speed, which is v-2 = 10-2 = 8 kmph. Answer is 8 kmph, which is option B.

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