1. Speed, Distance & Time Speed, Distance, Time Calculations

2. The objective of this lesson is to be able to use the correct formulas to calculate speed, distance or time.

3. 15 mins = 025 hour So: 3 hours 15 mins = 325 hours 30 mins = 05 hour So: 7 hours 30 mins = 75 hours 45 mins = 075 hour So: 2 hours 45 mins = 275 hours Reminder: How to change minutes into a decimal

4. The 3 formulas for Speed, Time & Distance: Speed = Distance Time Time = Distance Speed Distance =Speed xTime Remember them from this triangle: D ST Solving for SpeedSolving for TimeSolving for Distance

5. D ST A windsurfer travelled 28 km in 1 hour 45 mins. Calculate his speed. Speed = Distance Time 28 175 = = 16 km/h 1 hour 45 mins Answer: His speed was 16 km / hour

6. Let’s Try It! Speed = ? Distance = 25miles Time = 10minutes D ST

7. Let’s Try It! Speed = ? Distance = 15km Time = 8min. D ST

8. Let’s Try It! What is the speed of a car that traveled 150 miles in 2.5 hours? D ST

9. Your Turn! Speed = ? Distance = 39m Time = 20sec D ST

10. Your Turn! Speed = ? Distance = 235m Time = 120sec D ST

11. Your Turn! If a train travels 1500m in 250sec, how fast is the train traveling? D ST

12. 2 hour 30 mins Answer: He travelled 125 km A salesman travelled at an average speed of 50 km/h for 2 hours 30 mins. How far did he travel? D ST Distance = Speed x Time = 50 x 25 = 125 km

13. Let’s Try It! Speed = 12m/s Time = 15s Distance Traveled = ? D ST

14. Let’s Try It! Kiarra walks to school in the morning. It takes her 12 minutes to get to school when she walks at a speed of 3 miles per hour. How far does Kiarra live from school? D ST

15. Your Turn! Speed = 12mi./hr. Time = 3.4 hrs Distance Traveled = ? D ST

16. Your Turn! Jacob rides his bike to school. When he pedals at a speed of 4 meters per second, it takes him 9 minutes to get to school. How far does Jacob live from school? D ST

17. Your Turn! When Chris takes the bus to school, it takes him 15 minutes to get to school. If the bus is traveling at a speed of 25 miles per hour, how far does Chris live from the school? D ST

18. Answer: It took 9 hours 15 minutes A train travelled 555 miles at an average speed of 60 mph. How long did the journey take? D ST Time = Distance Speed 555 60 = = 925 hours= 9 hours 15 mins

19. Let’s Try It! Distance = 251 miles Speed = 70 mi/hr Time = ? D ST

20. Your Turn! Distance = 235 km Speed = 42km/hr Time = ? D ST

21. Your Turn! Beth is part of the school track team. She runs the 500 meter at a speed of 7 meters per second. What was her final time at the end of the race? D ST

22. Your Turn! Erica decides to walk home from school with her friends. If her house 1540 meters from school and she walks at a speed of 1.5 meters per second, how long will it take her to walk home? How many minutes would that be? D ST