**Question 16.**A man walks at a speed of 5 kmph for the first half of his journey and then increases his speed by 10% for the second half. If he covers a total distance of 20 km, how long does he take to complete the journey?

- (a)4.10 hours
- (b)3.15 hours
- (c) 3.82 hours
- (d)2.25 hours

**Question 17.**A train covers a distance of 300 km in 4 hours. If the speed of the train is increased by 20%, how long will it take to cover the same distance?

- (a) 3.33 hours
- (b)3.99 hours
- (c)4.33 hours
- (d)4.99 hours

**Question 18.**A car covers a distance of 120 km in 2 hours. If the car stops for 10 minutes every hour, what is its average speed in km per hour?

- (a) 61.25 km/h.
- (b) 33.91 km/h.
- (c) 43.89 km/h.
- (d) 51.5 km/h.

**Question 19.**A cyclist travels at a speed of 18 kmph for the first 3 hours and then reduces the speed by 15%. How far will the cyclist travel in the next 4 hours?

- (a)51.10 km
- (b)41.10 km
- (c) 61.2 km
- (d)71.20 km

**Question 20.**A boat can cover a certain distance downstream in 6 hours. If the speed of the boat is increased by 40%, how long will it take to cover the same distance downstream?

- (a)3.25 hours
- (b)4.10 hours
- (c) 4.29 hours
- (d)5.25 hours