Quiz Discussion

The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:

• 1] 1.2 km
• 2] 1.8 km
• 3] 2.4 km
• 4] 3.6 km
• 5] None of these

A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is:

• 1] 2 mph
• 2] 2.5 mph
• 3] 3 mph
• 4] 4 mph
• 5] None of these

A boat moves downstream at the rate of 1 km in \({ \text{7}}\frac{1}{2}\) minutes and upstream at the rate of 5 km an hour. What is the speed of the boat in the still water?

• 1]

  8 km/hour

• 2]

  \({ \text{6}}\frac{1}{2}\) km/hour

• 3]

  4 km/hour

• 4]

  \({ \text{3}}\frac{1}{2}\) km/hour

A man can row three-quarters of a kilometer against the stream in \(11\frac{1}{4}\) minutes and down the stream in \(7\frac{1}{2}\) minutes. The speed (in km/hr) of the man in still water is:

• 1] 2
• 2] 3
• 3] 4
• 4] 5

A boat takes half time in moving a certain distance downstream than upstream. The ratio of the speed of the boat in still water and that of the current is?

• 1] 2 : 1
• 2] 4 : 3
• 3] 1 : 2
• 4] 3 : 1

A man can row at 5 kmph in still water. If the velocity of current is 1 kmph and it takes him 1 hour to row to a place and come back, how far is the place?

• 1] 2.4 km
• 2] 2.5 km
• 3] 3 km
• 4] 3.6 km
• 5] None of these

A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is:

• 1] 4 km/hr
• 2] 5 km/hr
• 3] 6 km/hr
• 4] 10 km/hr

On a river , Q is the mid - point between two points P and R on the same bank of the river. A boat can go from P to Q and back in 12 hours, and from P to R in 16 hours 40 minutes. How long would it take to go from R to P?

• 1]

  \({ \text{3}}\frac{3}{7}\) hr

• 2]

  5 hr

• 3]

  \({ \text{6}}\frac{2}{3}\) hr

• 4]

  \({ \text{7}}\frac{1}{3}\) hr

A man can row upstream at 12km/hr and downstream at 18 km/hr. The man rowing speed in still water is?

• 1] 15 km/hr
• 2] 5 km/hr
• 3] 3 km/hr
• 4] 10 km/hr

A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:

• 1]

  8.5 km/hr

• 2]

  9 km/hr

• 3]

  10 km/hr

• 4]

  12.5 km/hr