Boats and Streams Problems Practice Question and Answer

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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.

Q:

एक व्यक्ति की धारा के अनुकूल चाल 9 किमी/घं. है और धारा के प्रतिकूल चाल 3 किमी/घं. है स्थिर पानी में उसकी चाल क्या है?

3356 0

  • 1
    12 किमी/घं.
    Correct
    Wrong
  • 2
    5 किमी/घं.
    Correct
    Wrong
  • 3
    10 किमी/घं.
    Correct
    Wrong
  • 4
    6 किमी/घं.
    Correct
    Wrong
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Answer : 4. "6 किमी/घं. "

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Answer : 1. "4 घंटे"

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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

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