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Sachin kaushik

· started a discussion

· 1 Months ago

sachin (Question: 128769.0 )

solution this qustion

Question:
The speed of a boatman in the direction of stream is 15 km/hr while the velocity of the stream is 1.5 km/hr. What is the velocity of the boatman against the stream?
Options:
A) 11 km/hr
B) 12 km/hr 
C) 16.30 km/hr
D) 14.75 km/hr
E) None of these
Solution:
Ans:(b)

Let the speed of boatman against the stream be a km/hr, 

then \(\cfrac{1}{2}\) (15 - a) = 1.5 

or 15 - a  = 3

\(\therefore\) a = 15  -  3  = 12  km/hr

Knowledge Expert

· commented

· 1 Months ago

Let the speed of boatman against the stream be a km/hr,

then 1/2 (15 - a) = 1.5

or 15 - a = 3

∴ a = 15 - 3 = 12 km/hr
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