Question
A man rows a boat 27 kms in 6 hours downstream and returns upstream in 18 hours. The speed of the stream (in km per hour) is:
Solution
Rate downstream = 27/6 = 4.5 km/hr Rate upstream = 27/18 = 1.5 km/hr Now, speed of the stream = (rate downstream – rate upstream)/2 ⇒ (4.5 – 1.5)/2 = 1.5 km/hr
More Boats and streams Questions
- A boat goes 12 km downstream in 2 hr and returns in 3 hr. Find speed of stream.
- Speed of current is equal to 35% of speed of boat in still water. If the boat takes 7 hours to cover 140 km in still water, then find the time taken by the...
- A boat can travel 4.2km upstream in 14min. If the ratio of the speed of the boat in still water to the speed of the stream is 7:1. How much time will the b...
- A boat can travel 28 km downstream in 30 min. The ratio of the speed of the boat in still water to the speed of the stream is 5: 3. How much time will the ...
- A boy can swim a certain distance downstream in 3 hours and return in 7 hours. If the rate of stream is 4 kmph then what is the speed of boy in still water...
- A submarine can travel a certain distance downstream in 4 hours and the same distance upstream in 8 hours. If the submarine's speed in still water is 12 km...
- Speed of a boat in still water is three times the speed of the boat in upstream. If the boat takes 15 minutes to cover 30 km in downstream, then find the s...
- Speed of current is equal to 15% of speed of boat in still water. If the boat takes 3 hours to cover 120 km in still water, then find the time taken by the...
- The speed of boat downstream and upstream is 28 km/hr and 18 km/hr respectively. Time taken to travel a distance of (m + 35) km downstream and (n + 22) km ...
- Boat ‘L’ moves 1.5 times faster than boat ‘K’ in still water. If both boats start at the same time from locations 270 km apart and move towards each other ...
Relevant for Exams:
