The speed of a boat along the stream is 12 km/h and against

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The speed of a boat along the stream is 12 km/h and against the stream is 8 km/h. The time taken by the boat to sail 24 km in still water is

1. 2 hours
2. 3 hours
3. 2.4 hours
4. 1.2 hours

Correct Option: C

Let the speed of boat in still water be x kmph and that of current be y kmph., then

⇒ 2x = 20
⇒ x = 10 kmph.
∴ speed of boat in still water be 10 kmph.
Distance = 24 km

∴ Required time =	24	= 2.4 hours
	10

We can find the required answer with the help of given formula :
Here, p = 12, q = 8

Speed of Boat =		p + q
		2

Speed of Boat =		12 + 8		= 10km/hr
		2

Time taken =	Distance
	Speed

Time taken =	24	= 2.4 hrs.
	10