Question

If the speed of motor boat is 20 km per hour, then will cover _ meter in 3 hours

Answer 1

Step-by-step explanation:

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A motor boat, whose speed is 20 km/hr in still water takes 1 hour more to go 48 km upstream than to return downstream to the same spot. Find the speed of the stream.

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ANSWER

Let, the speed of the stream be x km/hr

Speed of boat in still water =20 km/hr

∴Speed of boat with downstream 20+x km/hr

∴ Speed of boat with upstream 20−x km/hr

As per given condition

20−x48−20+x48=1

⟹48[20−x1−20+x1]=1

⟹[(20−x)(20+x)20+x−20+x]=481

⟹400−x22x=481

⟹96x=400−x2

⟹x

Answer 2

Answer:

60m

Step-by-step explanation:

1 hr=20m

So, 3hrs = 3×20m

= 60m

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