Aptitude - Boats and Streams - Discussion
Discussion Forum : Boats and Streams - General Questions (Q.No. 7)
7.
The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:
Answer: Option
Explanation:
Speed downstream = (15 + 3) kmph = 18 kmph.
| Distance travelled = |  |
18 x | 12 |  km = 3.6 km. |
| 60 |
Video Explanation: https://youtu.be/IDOwWUeOldQ
Discussion:
21 comments Page 1 of 3.
Likitha Ganta said:
2 years ago
Speed downstream = (15 + 3) kmph = 18 kmph. km.
Distance travelled = 18 * 12/60,
36/10 =>18/5 =>3.6km.
Distance travelled = 18 * 12/60,
36/10 =>18/5 =>3.6km.
(4)
Utoeyen said:
3 years ago
Thanks for giving a clear explanation @Bindu.
(1)
Himanth said:
4 years ago
So simple, here they are given, speed of the boat in still water=15 and rate of current=3.
And time is given in 12 min, So we convert into hours 12/60 = 1/5.
He also given downstream flow,
Speed = Distance/time.
15 + 3 = D/1/5,
18 * 1/5 = D,
D = 3.6 km.
And time is given in 12 min, So we convert into hours 12/60 = 1/5.
He also given downstream flow,
Speed = Distance/time.
15 + 3 = D/1/5,
18 * 1/5 = D,
D = 3.6 km.
(3)
Ananda said:
6 years ago
If we calculate the same question in upstream. Then the solution is;
Vikram said:
6 years ago
12 mins is 12*60 secs know? Why did they divide with 60 there?
(2)
Vinayak Mahadev said:
8 years ago
Speed of down stream= Still water speed + rate of current speed.
= 15 + 3 = 18.
18km/hrs for 1 hour (60 min).
Then find 12 min.
18 : 60
x : 12.
x= (12*18)/60 =3.6min.
That's all.
= 15 + 3 = 18.
18km/hrs for 1 hour (60 min).
Then find 12 min.
18 : 60
x : 12.
x= (12*18)/60 =3.6min.
That's all.
Sairam said:
9 years ago
@Lalitha.
Because time is in minutes, we have to change its unit of time from minutes to hours. So we have divide it.
If the distance is in meters then we have to multiply, to change it to seconds.
Because time is in minutes, we have to change its unit of time from minutes to hours. So we have divide it.
If the distance is in meters then we have to multiply, to change it to seconds.
Satish said:
9 years ago
Speed of boat in still water and speed of boat are different.
Why all are using this same u + v for still water? It's not correct. Both are different.
Why all are using this same u + v for still water? It's not correct. Both are different.
Lalitha said:
9 years ago
Why we are dividing 12/60, and why we are not multiplying it?
(1)
Nikul rana said:
10 years ago
Speed of still water = 15 kmph;
Speed of water current = 3 kmph;
Speed down stream = 18 kmph = 18 kmph;
Therefore; Distance traveled downstream = 18*12/60 = 3.6 km.
Speed of water current = 3 kmph;
Speed down stream = 18 kmph = 18 kmph;
Therefore; Distance traveled downstream = 18*12/60 = 3.6 km.
(1)
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