1. What is the speed of the boat in still water?

The boat's speed in still water is 13 km/hr.

2. What is the speed of the stream?

The stream's speed is 4 km/hr.

3. How do you calculate downstream speed?

Downstream speed is the sum of the boat's speed in still water and the stream's speed. In this case, it's 17 km/hr.

4. What is the formula for time, speed, and distance?

The formula is time = distance / speed.

5. How is downstream speed calculated?

Downstream speed = boat's speed in still water + stream's speed.

6. What is the downstream speed in this scenario?

The downstream speed is 17 km/hr.

7. What is the given distance for the downstream journey?

The distance for the downstream journey is 68 km.

8. How do you calculate time for the downstream journey?

Time = distance / downstream speed.

9. What is the time taken for the boat to go 68 km downstream?

It takes 4 hours.

10. How does the speed-time-distance formula relate to this problem?

The formula is used to calculate time, given distance and speed.

11. What does the speed-time-distance formula state?

Time = distance / speed.

12. How is speed related to distance and time?

Speed = distance / time.

13. What units should be consistent for the speed, distance, and time formula to work?

The units should be compatible; for example, if distance is in km and time in hours, speed will be in km/hr.

14. What happens to speed if distance increases while time remains constant?

Speed increases.

15. How is speed related to time when distance remains constant?

Speed is inversely proportional to time; if time increases, speed decreases.

16. What is the relation between speed and distance when time is constant?

Speed is directly proportional to distance; if distance increases, speed increases.

17. How can the formula be rearranged to solve for distance?

Distance = speed x time.

18. How is speed inversely proportional to time explained?

If time taken increases, speed decreases; if time decreases, speed increases.

19. What is the significance of compatible units in the formula?

Units need to be consistent for meaningful calculations; e.g., km for distance and hours for time.

20. How does the rearranged formula Time = Distance / Speed help?

It allows solving for time when distance and speed are known.

21. What does the formula Speed = Distance / Time help calculate?

It calculates the speed of an object when distance and time are known.