**Question 11.** A car covers a distance of 180 km in 3 hours. If the car stops for 15 minutes every hour, what is its average speed in km per hour?

- (a)24 km/h.
- (b) 48 km/h.
- (c) 55 km/h.
- (d) 65 km/h.

**Question 12.**A cyclist travels at a speed of 15 kmph for the first 2 hours and then reduces the speed by 10%. How far will the cyclist travel in the next 3 hours?

- (a) 22 km
- (b) 40.5 km
- (c) 34 km
- (d) 44 km

**Question 13.**A boat can cover a certain distance downstream in 4 hours. If the speed of the boat is increased by 50%, how long will it take to cover the same distance downstream?

- (a) 2.67 hours
- (b)2.55 hours
- (c)3.10 hours
- (d)3.45 hours

**Question 14.** A train covers a distance of 600 km in 7 hours. If it travels at a speed of 90 kmph for the first 2 hours and then reduces its speed by 30%, what will be its average speed for the entire journey?

- (a)65 km/h
- (b)55.71 km/h
- (c)80.71 km/h
- (d) 70.71 km/h

**Question 15.**A car travels at a speed of 80 kmph for the first 5 hours and then reduces its speed by 15%. How far will it travel in the next 4 hours?

- (a)200 km
- (b)312 km
- (c)412 km
- (d) 272 km