**(1)** A boat can travel with a speed of 20 km/hr in still water. If the speed of the stream is 5 km/hr, find the time taken by the boat to go 60 km downstream.

- (a) 2 hours
- (b) 3 hours
- (c) 2.4 hours
- (d) 4 hours

**(2)** A man rows his boat 90 km downstream and 45 km upstream, taking 3 hours each time. Find the speed of the stream.

- (a) 5 km/hr
- (b) 7.5 km/hr
- (c) 10 km/hr
- (d) 15 km/hr

**(3)** If a boat takes 1.5 hours less to travel 40 miles downstream than to travel the same distance upstream, and the speed of the stream is 4 mph, find the speed of the boat in still water.

- (a) 20 mph
- (b) 16 mph
- (c) 12 mph
- (d) 8 mph

**(4)** A boat takes 3 hours to travel 30 km upstream and 2 hours to return downstream. What is the speed of the boat in still water?

- (a) 8 km/hr
- (b) 10 km/hr
- (c) 12 km/hr
- (d) 15 km/hr

**(5)** A boat takes twice as long to row a certain distance upstream than downstream. The speed of the boat in still water is 15 km/hr. Find the speed of the stream.

- (a) 3 km/hr
- (b) 5 km/hr
- (c) 7.5 km/hr
- (d) 10 km/hr