Aptitude - Boats and Streams - Discussion
Discussion Forum : Boats and Streams - General Questions (Q.No. 6)
6.
A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?
Answer: Option
Explanation:
| Rate downstream = |  |
16 |  kmph = 8 kmph. |
| 2 |
| Rate upstream = | |
16 | kmph = 4 kmph. |
| 4 |
 Speed in still water = |
1 | (8 + 4) kmph = 6 kmph. |
| 2 |
Video Explanation: https://youtu.be/3D8uAfzz3l0
Discussion:
13 comments Page 2 of 2.
Riz said:
6 years ago
Simple explanation:
Downstream speed=16/2=8 km/hr=a.
Upstream speed=4 km/hr (mentioned in question) =b.
Speed of boat in still water=0.5 (a+b) =0.5 (8+4) =6 km/hr.
Downstream speed=16/2=8 km/hr=a.
Upstream speed=4 km/hr (mentioned in question) =b.
Speed of boat in still water=0.5 (a+b) =0.5 (8+4) =6 km/hr.
(1)
Ramesh Banothu said:
4 years ago
16/2 = 8,
16/4 = 4,
1/2(8+4) = 6kmph.
16/4 = 4,
1/2(8+4) = 6kmph.
(2)
Tanuja said:
2 years ago
Speed at downstream = 16/2 = 8kmph
Speed at upstream = 16/4 = 4kmph
Speed at downstream + speed at upstream = x + y + x - y.
ie
8 + 4 = 2x
So x = 6kmph.
Speed at upstream = 16/4 = 4kmph
Speed at downstream + speed at upstream = x + y + x - y.
ie
8 + 4 = 2x
So x = 6kmph.
(3)
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