Question

Ratio of upstream speed to downstream speed is 1 : 11. If speed of boat is 30 km/hr. Find the distance
covered in upstream in 5 hours ? (in km)
4.66
B. 55
C. 25
D.30 -
E.40
​

Answer 1

Answer:

speed of boat = (x+11x)/2 = 6x = 30 ,

x = 5

so ,.

speed of stream = 5x = 25km/h

distance in upstream in 5 hours = (30-25)*5 = 25km/h (ans)

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Answer 2

Option 'c' is correct.

Step-by-step explanation:

Since we have given that

Ratio of upstream speed to downstream speed = 1:11

So, Speed of upstream = x

Speed of downstream = 11x

Speed of boat = 30 km/hr.

So, it becomes,

$\dfrac{x+11x}{2}=30\\\\\dfrac{12x}{2}=30\\\\6x=30\\\\x=5\ km/hr$

So, Speed of upstream = 5 km/hr

Time = 5 hours

So, Distance covered in upstream is given by

$Speed\times Time\\\\=5\times 5\\\\=25\ km$

Hence, Option 'c' is correct.

# learn more:

A boat travels equal distance upstream and downstream. The upstream speed of boat is 10 km/hr, whereas the downstream speed is 20 km/hr.

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