Question : A boat covers a distance of 72 km downstream in 6 hours, while it takes 12 hours to cover the same distance upstream. What is the speed of the boat in still water?

Option 1: 6 km/hr

Option 2: 9 km/hr

Option 3: 10 km/hr

Option 4: 8 km/hr

Question : A boat covers 24 km upstream and 36 km downstream in 6 hours, while it covers 36 km upstream and 24 km downstream in $6\frac{1}{2}$ hours. The speed of the current is:

Option 1: 1 km/hr

Option 2: 2 km/hr

Option 3: 1.5 km/hr

Option 4: 2.5 km/hr

Question : A boat can go 40 km downstream and 25 km upstream in 7 hours 30 minutes. It can go 48 km downstream and 36 km upstream in 10 hours. What is the speed (in km/hr) of the boat in still water?

Option 1: 6

Option 2: 12

Option 3: 9

Option 4: 15

Question : The speed of a boat in still water is 15 km/hr, and the speed of the current is 5 km/hr. In how much time (in hours) will the boat travel a distance of 60 km upstream and the same distance downstream?

Option 1: 20

Option 2: 12

Option 3: 9

Option 4: 10

Question : A boat goes 2 km upstream and 3 km downstream in 20 minutes. It goes 7 km upstream and 2 km downstream in 53 minutes. What is the speed (in km/hr) of the boat in still water?

Option 1: $\frac{75}{7}$

Option 2: $\frac{120}{7}$

Option 3: $\frac{135}{7}$

Option 4: $\frac{150}{7}$