Question

If sum of upstream and downstream speed of a boat is 82 kmph, and the boat travels 105 km. upstream in 3 hr, Find the time taken by boat to cover 126 km downstream.???​

Answer 1

Answer:

hlo

your answer is here !

Step-by-step explanation:

Let Speed of boat in still water = b

Let Speed of still water = w

Then we know that,

Speed of Upstream = U = boat - water

Speed of Downstream = D = boat + water

Given, U + D = 82

b - w + b + w = 82

2b = 82

=> b = 41 kmph

From the given data,

41 - w = 105/3 = 35

w = 6 kmph

Now,

b + w = 126/t

=> 41 + 6 = 126/t

=> t = 126/47 = 2.68 hrs.

$follow \: \: \: me$

Answer 2

Well

It's easy

We will first find the speed of boat upstream that will be:105 ÷ 3= 35 km/h

Now it is given the speed of boat upstream and downstream when added give 82

So

Speed of boat downstream=82-35=47 km/h

So

We will find the time taken by boat at speed of 47 km/h to travel 126 km

Time taken by boat at speed of 47 km/h to travel 126 km:126÷47=2.6 hrs

So the answer is 2.68 hrs

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