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The velocity of a boat in still water is 9 km/hr, and the speed of the stream is 2.5 km/hr. How much time will the boat take to go 9.1 km against the stream?

A.

2hr. 40min

B.

1 hr. 20min

C.

2hr. 48min

D.

1hr. 24min

Answer with explanation

Answer: Option DExplanation

Answer with the Explanation:

ATQ,

Speed of boat in still water (Sb) = 9km/hr Speed of stream (Sc) = 2.5km/hr Distance against the stream = 9.1 km

Note: against the steam = upstream

Now, apply the formula:

The speed of boat upstream = speed of boat – the speed of the stream

The speed of upstream = 9-2.5 = 6.5km/hr Now, time= Distance/speed Time = 9.1/6.5, or 7/5 Or, time = 1[2/5] Or, 1hr + (2/5)*60 = 1hr + 24minutes

Workspace

Michel can swim in still water at the rate of 6km per hour. After swimming in a stream, she realized that she takes twice the time to go upstream as she takes to go downstream. What is speed of the current?

A.

2 km/hr

B.

2.25 km/hr

C.

1.5 km/hr

D.

4 km/hr

Answer with explanation

Answer: Option AExplanation

Workspace

Guddi’s swimming speed in still water to the speed of river is 7:1. She swims 4.2 km up the river in just 14 min. How much time will Guddi take to swim 18.4 km down the river?

A.

12 minutes

B.

11 minutes

C.

46 minutes

D.

23 minutes

Answer with explanation

Answer: Option CExplanation

Workspace

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