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)
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)
Vikram said:
6 years ago
12 mins is 12*60 secs know? Why did they divide with 60 there?
(2)
Naresh said:
1 decade ago
Speed of the boat in still water (b) = 15 kmph.
Speed of the Current/Stream (s) = 3 kmph.
Speed of downstream (d) = b + s ==> 15 + 3 kmph ==> 18 kmph.
So,
It can travel 18 km in 1 hour.
So,
How many km it can travel in 12 min?
1 hour ====> 18 km.
12/60 hour ====>?
Do cross multiplications, then we get 18*1/5==>3.6.
Speed of the Current/Stream (s) = 3 kmph.
Speed of downstream (d) = b + s ==> 15 + 3 kmph ==> 18 kmph.
So,
It can travel 18 km in 1 hour.
So,
How many km it can travel in 12 min?
1 hour ====> 18 km.
12/60 hour ====>?
Do cross multiplications, then we get 18*1/5==>3.6.
(1)
Utoeyen said:
3 years ago
Thanks for giving a clear explanation @Bindu.
(1)
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)
Kavya mareedu said:
1 decade ago
Thanks goutham.
Debasis said:
1 decade ago
How to calculate distance traveled = (18*12/60)?
NANDINI said:
1 decade ago
12/60 = 0.2.
18*0.2 = 3.6.
18*0.2 = 3.6.
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