# 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.
2 hours
3 hours
4 hours
5 hours
Explanation:

Speed downstream = (13 + 4) km/hr = 17 km/hr.

 Time taken to travel 68 km downstream = 68 hrs = 4 hrs. 17

Discussion:
42 comments Page 1 of 5.

Nikita said:   6 days ago
Relative speed = B + w = 15km/hr.
T = D/Relative speed,
T = 68/15=4hours.

Ammu S said:   1 year ago
thank you everyone for the explanation.
(9)

Speed(s) = boat speed(u) + stream speed(v) = 13 + 4 = 17km/h and distance = 68km;
We know that speed = distance/time.
But we have to find the time then,
Time = distance/speed.
Time = 68/17 = 4 hours.
(14)

Dharmendra said:   1 year ago
In this question, we have seen boat and steam both speeds are in one side so we have to include both speeds [13+4]=17 and distance is 68.

So, 68Ã·17 = 4hour.
(4)

Hunde Namomsa said:   2 years ago
Thanks everyone for explaining the answer.
(3)

Tanisha said:   3 years ago
Thanks @Srikant.
(2)

Hanumanthu vinayakarao said:   4 years ago
Distance = speed / time.
Then time = distace/ speed.
Speed = boat speed+stream speed.
Speed = 13+4=17 distance = 68.
D = 68/17 = 4hrs.
(2)

Bhushan roy said:   4 years ago
Thanks for the nice explanation.

Venky said:   4 years ago
Thanks to all for giving an explanation.

MD ABDUL KHABIR said:   4 years ago
Thank you all for explaining it clearly.