Aptitude - Boats and Streams - Discussion
Discussion Forum : Boats and Streams - General Questions (Q.No. 1)
1.
A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
Answer: Option
Explanation:
Speed downstream = (13 + 4) km/hr = 17 km/hr.
| Time taken to travel 68 km downstream = |  |
68 |  hrs = 4 hrs. |
| 17 |
Discussion:
46 comments Page 2 of 5.
GauravBagul said:
7 years ago
13+4 = 17km/hr,
For 1 hour he goes 17 km.
Then for 68 km he takes 4 hrs.
For 1 hour he goes 17 km.
Then for 68 km he takes 4 hrs.
(2)
A.Santhosh said:
8 years ago
Boat -> a kmph& stream-> b kmph
A= boat speed at still water
B= water speed=rate of current=stream speed.
Along with the flow, Dss(downstream speed) = a+b,
Againist with the flow, Uss(upstream speed) = a-b.
So, a + b = 13 + 4 = 17,
Distance = 68 km,
Time = Dist/Uss,
T = 68/17 = 4hrs.
A= boat speed at still water
B= water speed=rate of current=stream speed.
Along with the flow, Dss(downstream speed) = a+b,
Againist with the flow, Uss(upstream speed) = a-b.
So, a + b = 13 + 4 = 17,
Distance = 68 km,
Time = Dist/Uss,
T = 68/17 = 4hrs.
(1)
Balaji said:
1 decade ago
In the question they given the data that
speed of boat 13 km/hr and speed of stream is 4 km/hr
and they asked us to solve the time taken by the boat in down stream for a distance of 68 kms.
we know as per the formula down stream means speed of boat + speed of stream
therefore,
down stream = 13+4=17 km/hr
as per the problem we got to find time taken by boat to travel a distance of 68km down stream.
we have formula that, time=distance/speed
=68/17
=4 hours
speed of boat 13 km/hr and speed of stream is 4 km/hr
and they asked us to solve the time taken by the boat in down stream for a distance of 68 kms.
we know as per the formula down stream means speed of boat + speed of stream
therefore,
down stream = 13+4=17 km/hr
as per the problem we got to find time taken by boat to travel a distance of 68km down stream.
we have formula that, time=distance/speed
=68/17
=4 hours
(1)
Vadivel said:
8 years ago
Thaks for explaining the answer friends.
(1)
Birla Jyothi Swaroop said:
8 years ago
Perfect Explanation, thank @Santhosh.
(1)
Ardhendu Sikdar said:
8 years ago
13+4 = 17km/hr.
Now, 48/17 = 4hr.
Now, 48/17 = 4hr.
(1)
Mythu said:
8 years ago
Thanks for all your explanations.
(1)
Elizabath said:
7 years ago
Give a clear explanation to get it.
(1)
Sheetul said:
7 years ago
Thank you so much @Balaji.
(1)
T dhinesh said:
1 year ago
13 km/hr
4 km/hr
= 13 + 4 = 17km/hr.
Downstream = 68 km.
= 68/17.
= 4hours.
4 km/hr
= 13 + 4 = 17km/hr.
Downstream = 68 km.
= 68/17.
= 4hours.
(1)
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