Question 59

Speed of a boat in still water is 13 km/h. Speed of water current is 4 km/h. In what time can the boat cover 68 km upstream?

Solution

Given,

Speed of a boat in still water is 13 km/h and Speed of water current is 4 km/h.

Upstream speed = Speed of a boat in still water - Speed of water current

∴ Upstream speed = 13 - 4 = 9

we know that $$Speed = \frac{Distance}{time}$$

$$9 = \frac{68}{time}$$

$$time = \frac{68}{9}$$

time = 7.55

converting 7.55 to hours, 7 hours and $${0.55}\times{60}$$ = 33 min

∴ The answer is 7hours and 33min

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