**Question 6.**A boat can cover a certain distance downstream in 5 hours. If the speed of the boat is doubled, how long will it take to cover the same distance downstream?

- (a)1.4 hours
- (b)2.75 hours
- (c) 2.5 hours
- (d)3.5 hours

**Question 7.**A train covers a distance of 480 km in 6 hours. If it travels at a speed of 80 kmph for the first 3 hours and then reduces its speed by 20%, what will be its average speed for the entire journey?

- (a)70.25 km/h.
- (b) 71.11 km/h.
- (c) 72.55 km/h.
- (d) 73.55 km/h.

**Question 8.** A car travels at a speed of 72 kmph for the first 4 hours and then reduces its speed by 25%. How far will it travel in the next 2 hours?

- (a) 98 km
- (b) 80 km
- (c) 110 km
- (d) 108 km

**Question 9.**A man walks at a speed of 6 kmph for the first half of his journey and then increases his speed by 20% for the second half. If he covers a total distance of 30 km, how long does he take to complete the journey?

- (a) 5 hours
- (b) 6.25 hours
- (c) 4.58 hours
- (d) 3 hours

**Question 10.** A train covers a distance of 400 km in 5 hours. If the speed of the train is increased by 25%, how long will it take to cover the same distance?

- (a)2 hours
- (b) 4 hours
- (c)3 hours
- (d)6 hours