Boat and Stream Practice Question and Answer

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Answer : 4. "8:3"
Explanation :

Answer: D) 8:3 Explanation: Let the speed of the boat upstream be p kmph and that of downstream be q kmph   Time for upstream = 8 hrs 48 min = 845hrs   Time for downstream = 4 hrs   Distance in both the cases is same.   => p x  845= q x 4   => 44p/5 = 4q   => q = 11p/5    Now, the required ratio of Speed of boat : Speed of water current   = q+p2:q-p2   => (11p/5 + p)/2  : (11p/5 - p)/2   => 8 : 3

Q:

एक नाव धारा के प्रतिकूल 24 कि.मी. दूरी 6 घंटे में तय करता है और धारा की दिशा में 20 कि.मी. दूरी 4 घंटे में तय करता है, तो शांत जल में नाव की चाल तथा धारा की चाल ज्ञात करें ।

1104 0

  • 1
    4 किमी प्रति घंटा और 3 किमी प्रति घंटा
    Correct
    Wrong
  • 2
    4.5 किमी प्रति घंटा और 0.5 किमी प्रति घंटा
    Correct
    Wrong
  • 3
    4 किमी प्रति घंटा और 2 किमी प्रति घंटा
    Correct
    Wrong
  • 4
    5 किमी प्रति घंटा और 2 किमी प्रति घंटा
    Correct
    Wrong
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Answer : 1. "4 किमी प्रति घंटा और 3 किमी प्रति घंटा"

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Answer : 4. "3 घंटा"

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Answer : 2. "9 km/hr, 3 km/hr"
Explanation :

Answer: B) 9 km/hr, 3 km/hr Explanation: Let the speed of the boat = p kmph Let the speed of the river flow = q kmph From the given data, 2 x 28p + q = 28p - q   => 56p - 56q -28p - 28q = 0 => 28p = 84q => p = 3q. Now, given that if 283q + 2q + 283q - 2q = 67260=> 285q + 28q = 67260=> q = 3 kmph=> x  =3q = 9 kmph   Hence, the speed of the boat = p kmph = 9 kmph and the speed of the river flow = q kmph = 3 kmph.

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Answer : 3. "10"

Q:

एक व्यक्ति 8 घंटे में धारा की दिशा मे 30 कि.मी. दूरी तय करके वापस आ जाता है । यदि शांत जल में नाव की चाल धारा की चाल की चार गुनी है, तो धारा की चाल ज्ञात करे । 

1621 0

  • 1
    1 किमी/घंटा
    Correct
    Wrong
  • 2
    2 किमी/घंटा
    Correct
    Wrong
  • 3
    4 किमी/घंटा
    Correct
    Wrong
  • 4
    3 किमी/घंटा
    Correct
    Wrong
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Answer : 2. "2 किमी/घंटा"

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