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 5 of 8.
Deepika said:
8 years ago
Sir, I have one doubt.
Given downstream speed (i.e speed of boat with stream)is 15 km/hr .asked ..upstream speed is( boat speed(u)- stream speed(v)).
Here to find the boat speed we use boat speed= downstream speed - stream speed.what should we do if upstream speed( speed of boat against stream) is given in the question.
Should we do like this, boat speed=upstream speed+ stream speed.
Given downstream speed (i.e speed of boat with stream)is 15 km/hr .asked ..upstream speed is( boat speed(u)- stream speed(v)).
Here to find the boat speed we use boat speed= downstream speed - stream speed.what should we do if upstream speed( speed of boat against stream) is given in the question.
Should we do like this, boat speed=upstream speed+ stream speed.
Akash r said:
8 years ago
Thank you @Balaji.
Peauts said:
7 years ago
You are right @Deepika
a=u+v(speed of downstream/speed of man with the stream(i.e)he is going along with the stream)
u=a-v (speed of the man alone)=12.5
b=u-v
if b is given:
put b=u-v
So, u=b+v.
a=u+v(speed of downstream/speed of man with the stream(i.e)he is going along with the stream)
u=a-v (speed of the man alone)=12.5
b=u-v
if b is given:
put b=u-v
So, u=b+v.
Abc said:
7 years ago
Not getting. Please, someone, help me to get it.
HARI said:
7 years ago
Speed in current =15,
Current speed =2.5,
Upstream =15-2.5=12.5,
Downstream =15+2.5=17.5.
Current speed =2.5,
Upstream =15-2.5=12.5,
Downstream =15+2.5=17.5.
SHRIPAD said:
7 years ago
Thanks @Atuljain.
Sijohn joy said:
7 years ago
d=15 y=2.5.
u=?.
15-u/2=2.5,
15-u=5,
u=15-5=10.
u=?.
15-u/2=2.5,
15-u=5,
u=15-5=10.
Paddu said:
7 years ago
Thank you @Mani.
Yogi said:
7 years ago
I am not understanding this. Please explain me.
Ankita Chandra said:
7 years ago
Man's speed + speed of current = 15,
Man's speed + 2.5 = 15,
Man's speed = 15 - 2.5 = 12.5,
Man's rate against the current i.e. difference between their speed ( u-v).
Man's speed - speed of current.
= 12.5 - 2.5,
= 10.
Man's speed + 2.5 = 15,
Man's speed = 15 - 2.5 = 12.5,
Man's rate against the current i.e. difference between their speed ( u-v).
Man's speed - speed of current.
= 12.5 - 2.5,
= 10.
(1)
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