Question

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?
a. 75 km/hr
b. 70 km/hr
c. 60 km/hr
d. 65 km/hr

Answer 1

Answer:

65 km/hr

Step-by-step explanation:

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Answer 2

Answer:

Downstream speed of boat = 70 km/hour

Step-by-step explanation:

Given that-

The upstream speed of a boat = 40 km/hr

Speed of boat in still water = 55 km

So, speed of stream = Speed of the boat in still water - upstream speed of the boat

                                  = 55 - 40

Speed of stream = 15 km/hour

Downstream speed of the boat = speed of the boat in still water + speed of the stream

                                             = 55 + 15

Downstream speed of boat = 70 km/hour