**Question 31.** A train covers a distance of 600 km in 8 hours. If it covers half the distance at a speed of 80 kmph and the other half at a speed of 100 kmph, what is the average speed of the train for the entire journey?

- (a)92.12 km/h.
- (b)87.5 km/h.
- (c) 88.89 km/h.
- (d)71.85 km/h.

**Question 32.** A car travels at a speed of 60 kmph for the first 4 hours, 50 kmph for the next 3 hours, and 40 kmph for the remaining distance. If the total distance covered is 350 km, how long does the car take to complete the journey?

- (a) 5 hours
- (b) 6 hours
- (c) 7 hours
- (d) 8 hours

**Question 33.**A boat can travel a certain distance downstream in 5 hours. If it covers the same distance upstream in 10 hours, what is the speed of the boat in still water and the speed of the stream?

- (a) 3,4
- (b) 5,4
- (c) 2,8
- (d) None of the above

**Question 34.** A train covers a distance of 800 km in 10 hours. If it covers half the distance at a speed of 80 kmph and the other half at a speed of 100 kmph, what is the average speed of the train for the entire journey?

- (a) 87.5 km/h.
- (b) 90 km/h.
- (c) 88.89 km/h.
- (d) 92.65 km/h.

**Question 35.** A car travels at a speed of 45 kmph for the first 3 hours, 60 kmph for the next 2 hours, and 30 kmph for the remaining distance. If the total distance covered is 225 km, how long does the car take to complete the journey?

- (a) 82.50 km/h.
- (b) 81.55 km/h.
- (c) 88.89 km/h.
- (d) 75.10 km/h.