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If the speed of a boat in still water is 20km/hr and the speed of the current is 5km, then the time taken by the boat to travel 100 km with the current is?

12 hr
23 hr
34 hr
47 hr

Answer:- 1

Explanation:-

Solution:

\begin{aligned} Relative speed \\ =  20  +  5  =  25 km/hr \\ time  = \frac{100}{25} = 4 hours \end{aligned}

$\eqalign{ & {\text{Relative speed }} \cr & {\text{ = 20 + 5 = 25 km/hr}} \cr & {\text{time = }}\frac{{100}}{{25}} = 4{\text{ hours}} \cr}$

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", "dateCreated": "7/24/2019 10:09:12 AM", "author": { "@type": "Person", "name": "Nitin Sir" } }, "suggestedAnswer": { "@type": "Answer", "text": "

Solution:

\begin{aligned} Relative speed \\ =  20  +  5  =  25 km/hr \\ time  = \frac{100}{25} = 4 hours \end{aligned}

$\eqalign{ & {\text{Relative speed }} \cr & {\text{ = 20 + 5 = 25 km/hr}} \cr & {\text{time = }}\frac{{100}}{{25}} = 4{\text{ hours}} \cr}$ ", "dateCreated": "7/24/2019 10:09:12 AM" } }

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