Boat and Stream Practice Question and Answer
7 Q: If a sailer sails 12 km distance within 5 hours against the flow of a river. If he sails 22 km distance in same time along the flow of the river. Then velocity of the river is _______
2043 05e788081948fba6459010c46
5e788081948fba6459010c46- 11 km / hourtrue
- 22 km / hourfalse
- 31.5 km / hourfalse
- 42.5 km / hourfalse
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Answer : 1. "1 km / hour "
Q: A man swims downstream distance of 15 km in 1 hour. If the speed of the current is 5 km/ hr, the time taken by the man to swim the same distance upstream is :
1144 05dd6230bc2282c484e4b25d3
5dd6230bc2282c484e4b25d3- 11 hr 30 minfalse
- 245 minfalse
- 32 hr 30 minfalse
- 43 hrstrue
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Answer : 4. "3 hrs"
Q: A man can row 30 km downstream and return in a total of 8 hours. If the speed of the boat in still water is four times the speed of the current, then the speed of the current is:
1621 05dd62400c2282c484e4b29dc
5dd62400c2282c484e4b29dc- 11 km/hrfalse
- 22 km/hrtrue
- 34 km/hrfalse
- 43 km/hrfalse
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Answer : 2. "2 km/hr "
Q: Ratio between speed of boat in still water to speed of stream is 7 : 2. If 126 km is travelled downstream in 3.5 hours then find the difference between speed of boat in still water to speed of stream(in kmph)?
1456 05df9b6329e7c624c9bfe82fd
5df9b6329e7c624c9bfe82fd- 115false
- 222false
- 324false
- 420true
- 518false
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Answer : 4. "20"
Q: The speed of the current is 5 km / hour. A motorboat goes 10 km upstream and back again to the starting point in 50 minutes. The speed (in km / hour) of the motorboat in still water is:
1220 05dd62299a1c5834595c3a927
5dd62299a1c5834595c3a927- 120false
- 226false
- 325true
- 428false
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Answer : 3. "25 "
Q: A boat running downstreams covers a distance of 30 kms in 2 hours. While coming back the boat takes 6 hours to cover the same distance. If the speed of the current is half that of the boat, what is the speed of that boat in kmph?
1348 05da3fe99d691092704739eeb
5da3fe99d691092704739eeb- 115false
- 25false
- 310true
- 4Cannot be determinedfalse
- 5None of thesefalse
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Answer : 3. "10"
Q: A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively? 1513 05b5cc6bce4d2b4197774d88b
5b5cc6bce4d2b4197774d88b- 17:4false
- 211:4false
- 34:7false
- 48:3true
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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