Question

Q. Ratio of speed of boat in still water to the speed of current is 10:1. Ratio of time taken by the boat to
cover D km in downstream to the time taken by the boat to cover (D-45) km in upstream is 3:2. Then find
the value of D?
(a) 60 km
(b) 87 km
(C) 99 km
(d) 108 km
(e) 90 km​

Answer 1

Answer:

ANSWER

Solution:

Given Equation:  Speed of boat in still water =10 km\hr

Boat Travels a distance of 37.5 km in time 5 hr.

Factor to consider speed of stream be 's'

According to the formula:

Speed =  

Time

Distance

​  

 

Total speed = speed of boat in still water and speed of stream

Since the boat travels upstream

Total speed = Speed of boat in still water - speed of water in stream

10−s=  

5

37.5

10−s=7  

2

1

​s=2.5 km\hr

Step-by-step explanation:

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