Aptitude - Boats and Streams - Discussion
Discussion Forum : Boats and Streams - General Questions (Q.No. 2)
2.
A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:
Answer: Option
Explanation:
Man's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr.
Man's rate against the current = (12.5 - 2.5) km/hr = 10 km/hr.
Discussion:
72 comments Page 4 of 8.
BISHU MURMU said:
6 years ago
Thanks all for explaining this.
Praveen said:
6 years ago
MS with CS = 15.
CS = 2.5,
MS = 15-2.5= 12.5.
Against means Opp direction so it is Upstream For this MS - CS so 12.5 -2.5 = 10.
CS = 2.5,
MS = 15-2.5= 12.5.
Against means Opp direction so it is Upstream For this MS - CS so 12.5 -2.5 = 10.
Nihal said:
6 years ago
A boat has speed along current of 5 km/h and speed against current is 1 km/h. What will be speed of boat and speed of Current? please give me the solution.
Nilesh said:
6 years ago
4 answer 6 respectively. @Nihal.
And well explained by @Mani.
Thanks.
And well explained by @Mani.
Thanks.
Swathi said:
8 years ago
Why can't we use the formula 1/2 (a-b) to get the upstream value directly?
That time the answer would be 20 km/hr. Please tell me.
That time the answer would be 20 km/hr. Please tell me.
Ahamed Kabeer said:
4 years ago
Thank you everyone for explaining this.
Samyakjain said:
5 years ago
Thank you so much @Balaji.
Mani said:
1 decade ago
Here they did not mention that is/clearly not questioned that this is a boad and stream problem.
Ramakrishna said:
1 decade ago
Given that mans speed with current means mans speed+current = 15, So here current is given from which we get actual speed of man is 12.5km/hr, Then he asked against the current so the answer will be 12.5 - 2.5=10km/hr.
Arun.D said:
1 decade ago
Man's speed with the current = 15 km/hr.
Speed of the current = 2.5 km/hr.
Man's speed against the current=?
Downstream = (u+v)km/hr.
u+v = 15.
v = 2.5.
u+2.5 = 15.
u = 15-2.5.
u = 12.5km/hr.
Upstream = (u-v)km/hr.
= (12.5-2.5)km/hr.
= 10km/hr.
Speed of the current = 2.5 km/hr.
Man's speed against the current=?
Downstream = (u+v)km/hr.
u+v = 15.
v = 2.5.
u+2.5 = 15.
u = 15-2.5.
u = 12.5km/hr.
Upstream = (u-v)km/hr.
= (12.5-2.5)km/hr.
= 10km/hr.
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