Boat and Stream Practice Question and Answer
8 Q: In a river the distance between two points is 80 km. A boat which rows 13 km/h in still water goes downstream from the first point to the second and returns upstream to starting point in 13 hrs., then find the speed of current.
1340 061555b3cffe69f11b0d317f4
61555b3cffe69f11b0d317f4- 15 km / hfalse
- 23 km / htrue
- 32 km / hfalse
- 4None of thesefalse
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Answer : 2. "3 km / h "
Q: A man went downstream for 28 km in a motor boat and immediately returned. It took the man twice as long to make the return trip. If the speed of the river flow were twice as high, the trip downstream and back would take 672 minutes. Find the speed of the boat in still water and the speed of the river flow. 52778 05b5cc672e4d2b4197774c0c8
5b5cc672e4d2b4197774c0c8- 112 km/hr, 3 km/hrfalse
- 29 km/hr, 3 km/hrtrue
- 38 km/hr, 2 km/hrfalse
- 49 km/hr, 6 km/hrfalse
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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: A man can swim at the rate of 3 km/hr. in still water. Then, if speed of the stream is 2 km/hr., then in what time he will cover a total distance of 5 km in with the stream and against the stream?
1144 0611f7cc2b14e9c13a8ec16fa
611f7cc2b14e9c13a8ec16fa- 16 hourstrue
- 26.5 hoursfalse
- 34 hoursfalse
- 45 hoursfalse
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Answer : 1. "6 hours"
Q: A boat running upstream takes 7 hours and 40 minutes to cover a certain distance while it takes 5 hours to cover the same distance downstream. What is the ratio between the speed of the current and speed of the boat respectively?
870 060f7d8563ca0726dff350803
60f7d8563ca0726dff350803- 113: 4false
- 217: 4false
- 319: 4false
- 44: 19true
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Answer : 4. "4: 19 "
Q: A boat covers 48 km. upstream and 72 km. downstream in 12 hours, while it covers 72 km. upstream and 48 km. downstream is 13 hours. The speed of stream is -
908 060f7d5753ca0726dff34f9e6
60f7d5753ca0726dff34f9e6- 12.5 kmphfalse
- 24 kmphfalse
- 32 kmphtrue
- 42.2 kmphfalse
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Answer : 3. "2 kmph"
Q: The speed of a boat in still water 11 km/hr. It can go 12 km upstream and return downstream to the engine point in 2hr 45min. What is the speed of stream?
894 060ba11fb02ea6c40949f4b73
60ba11fb02ea6c40949f4b73- 13 km/hr.false
- 22 km/hrfalse
- 35 km/hrtrue
- 44 km/hrfalse
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Answer : 3. "5 km/hr"
Q: A person swims a distance of 28 km. in the direction of stream in 5 hours and a distance of 13 km. in 5 hours against the stream. What is the velocity of the stream?
971 06099114ff738a51c29aa3141
6099114ff738a51c29aa3141- 12.5 km./hr.false
- 21.8 km./hr.false
- 32 km./hr.false
- 41.5 km./hr.true
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Answer : 4. "1.5 km./hr."
Q: A man can row with the stream at 9 km/hr. and against the stream at 3 km/hr. His speed in still water is -
3482 0608fc0278ab61162923103bb
608fc0278ab61162923103bb- 112 km/hrfalse
- 25 km/hrfalse
- 310 km/hrfalse
- 46 km/hrtrue
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