SJIT ECE PLACEMENT PRACTICE TEST-2

Alex can row a boat at 7 kmph downstream and 3 kmph upstream. Calculate her rowing speed in still water and the rate of the current?

• 5 Kmph and 2 kmph

• 7.5 kmph and 3 Kmph

• 6.4 kmph and 14 kmph

• None of the above

Sam’s Rowing speed is 10 kmph, but he takes double time in rowing the boat upstream in comparison to downstream. Calculate the rate of the stream?

• 3.33 kmph

• 4.33 kmph

• 5.33 kmph

• 333 kmph

What will be the speed of the boat if the river flows at a speed of 2 km/hr, and it takes 12 minutes to cover 4 km upstream?

• 21

• 22

• 16

• 30

Sam rows a boat at a speed of 6 kmph in still water. If the speed of the stream 2 kmph, in how much time will Sam take to cover 34 km downstream?

• 7

• 3

• 4.5

• 6

Tom takes 2 hours to sail a boat for 4 km against the stream and can cover 2 km distance in 20 minutes if he rows the boat along with the current of the river. Calculate the time taken to cover 10 km in stagnant water?

• 1 3/7

• 2 2/3

• 4 7/9

• 5 7/9

The speed of a boat in still water is 4.5 kmph, and the rate of the river flow is 3 kmph. Calculate the total time taken by Agatha to cover a distance of 75 km to and fro in the same river?

• 4O hrs

• 3O hrs

• 6O hrs

• 5O hrs

Sam takes triple time to row a boat against the stream of the river than the time he takes to row with the stream to cover the same distance. What will be the ratio between the speed of the boat in still water to that of the flow?

• 2:1

• 3:2

• 3:1

• 4:3

Tom rows for 7 hours to cover a distance of 24 km of the lake. Later he analyses that he takes the same time to cover 8 km distance with the stream and 6 km distance against the stream. Calculate the rate of the stream?

• 2/7

• 5/7

• 6/7

• 1/7

A boat takes 20 hours to travel downstream from point P to Point Q. and coming back to a point R midway between P and Q. If the velocity of the stream is 5 kmph, and speed of the boat in still water is 13 kmph, then what is the distance between P and Q?

• 122.4 kmph

• 200 kmph

• 150 kmph

• 180 kmph

Calculate the distance covered by a boat downstream in 24 minutes if the speed of the boat in still water is 30 kmph and the speed of the current is 6 kmph?

• 14.4km

• 12.3 km

• 10 km

• 5 km