A man can row 6 km/h in still water. If the speed of the current

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 Multiple Choice QuestionsMultiple Choice Questions

1.

A man can row 15 km per hour downstream and 9 km per hour upstream. The speed (in kmph) of the boat in still water is

  • 10

  • 12

  • 15

  • 15

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2.

A boat covers 12 km upstream and 18 km downstream in 3 hours, while it covers 36 km upstream and 24 km downstream in 

What is the speed of the current?

  • 1.5 km/hr

  • 1 km/hr

  • 2 km/hr

  • 2.5 km/hr

819 Views

3.

A man can row against the current three-fourth of a kilometre in 15 minutes and returns the same distance in 10 minutes. The ratio of his speed to that of the current is

  • 3 : 5

  • 5 : 3

  • 1 : 5

  • 1 : 5

389 Views

4.

A boat moves downstream at the rate of 1 km in 7 1 half space minutes and upstream at the rate of 5 km an hour. what is the speed of the boat in the still water?

  • 3 1 half space km divided by hour
  • 6 1 half space km divided by hour
  • 4 km/hour

  • 4 km/hour

744 Views

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5.

If the speed of a boat in still water is 20 km/hr and the speed of the current is 5 km/hr, then the time taken by the boat to travel 100 km with the current is

  • 2 hours

  • 3 hours

  • 4 hours

  • 4 hours

123 Views

6.

A boat moves downstream at the rate of 8 km/hr and upstream at 4 km/hr. The speed of the boat in still water is:

  • 4.5 km/hr

  • 5 km/hr

  • 6 km/hr

  • 6.4 km/hr

123 Views

7.

Speed of a boat along and against the current are 14 km/hr and 8 km/hr respectively. The speed of the current is

  • 11 km/hr

  • 6 km/hr

  • 5.5 km/hr

  • 3 km/hr

136 Views

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8.

A man can row 6 km/h in still water. If the speed of the current is 2 km/h, it takes 3 h more in upstream than in the downstream for the same distance. The distance is

  • 30 km

  • 24 km

  • 20 km

  • 32 km


B.

24 km

A man speed in downstream  = (6 + 2)km/h = 8 km/h
A man speed in upstream = (6 - 2) km/hr = 4 km/h
Let required distance be x km
According to the question,
     rightwards double arrow space space space straight x over 4 space minus space straight x over 8 space equals space 3
rightwards double arrow space space space fraction numerator 6 straight x minus 3 straight x over denominator 24 end fraction space equals space 3
rightwards double arrow space space space fraction numerator 3 straight x over denominator 24 end fraction space equals space 3
rightwards double arrow space space space straight x space equals space 24 space km

75 Views

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9.

A ship is moving at a speed of 30 km/h. To know the depth of the ocean beneath it. It sends a radio wave which travels at a speed 200 m/s. The ship receives the signal after it has moved 500 m. The depth of the ocean is

  • √143/2 km

  • 12 km

  • 6 km

  • 8 km

73 Views

10.

A swimmer swims from a point A against a current for 5 min and then swims backwards in favour of the current for next 5 min and comes to the point B. If AB = 100 m, then the speed of the current in (km/h) is

  • 1

  • 0.6

  • 0.4

  • 0.2

60 Views

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