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The upstream speed of the boat is 40 km/hr and the speed of the boat in still water is 55 km/hr. What is the downstream speed of the boat?

A75 km/hr

B70 km/hr

C60 km/hr

D65 km/hr

Answer:

B. 70 km/hr

Read Explanation:

Let, speed of the stream = x km/hr According to the question, ⇒ 55 - x = 40 ⇒ x = 15 ∴ Downstream speed of the boat = (55 + 15) = 70 km/hr


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