Question

The current of a stream runs at the rate of 4 km/hr. Aboat goes 6 km and comes back to the starting point in 2 hours. The speed of the boat in still water is
(1) 6 km/hr
(2)8km/hr
(3) 7.5 km/hr
(4)6.8 km/h​

Answer 1

Answer:

Let the speed in still water be x km/hr

Then, 6/x + 4 + 6/x - 4 = 2

⇒ 6[ x - 4 + x + 4] = 2(x2 - 16)

⇒ x2 - 6x - 16 = 0

⇒ (x - 8) (x + 2) = 0

∴ x = 8 km/hr

hence, (2) is correct

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Answer 2

Answer:

The current of a stream runs at the rate of 4 km/hr. A boat goes 6 km and back to the starting point in 2 hours.

Step-by-step explanation:

answer is first one6 km/ hr