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Close your eyes and imagine you are a… …

Close your eyes and imagine you are a… …. You start from the bus driver’s home to pick up 5 students from Ang Mo Kio before reaching the school. How do you think the speed which you are traveling will be like? Will it be a constant speed ?. School bus.

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Close your eyes and imagine you are a… …

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  1. Close your eyes and imagine you are a… … You start from the bus driver’s home to pick up 5 students from Ang Mo Kio before reaching the school. How do you think the speed which you are traveling will be like? Will it be a constant speed ? School bus

  2. Constant speed means uniform speed, or steady speed, or fixed speed. The speed does not change throughout the journey.

  3. Since the bus does not travel in a constant speed, how can we still find out how fast it travels? Yes! We use Average Speed. It is calculated based on the TOTAL distance travelled and the TOTAL time taken.

  4. Total Distance Average Speed = Total Time We know speed is the distance travelled per unit time, hence

  5. Example A cyclist cycled from Serangoon Road to Rosyth School. The cyclist started traveling at 6 a.m. and reached Rosyth School at 7 a.m. What is the cyclist’s average speed if the distance between Serangoon Road and Rosyth School is 7 km? Time Taken = 1 h Average Speed = Total Distance ÷ Total Time = 7 ÷ 1 = 7 The cyclist’s average speed is 7 km/h.

  6. How to memorise the formula? Distance Speed = Time Distance Time = Speed D S T Distance = Speed x Time

  7. Distance Speed = Time D 20 2 = = 10 S T Using this Model, solve the following questions. John started cycling at 7.30 a.m. By 9.30 a.m. he had covered a distance of 20 km. Find his average speed in km/h. John’s average speed is 10 km/h.

  8. Distance 300 Time taken = = h Speed 60 Mr Li took 4 hours to drive from Town P to Town Q at an average speed of 75 km/h. On his way back, he drove at an average speed of 60 km/h. How long did he take to drive back from Town Q to Town P? Distance between Town P and Q = Speed x Time = (75 x 4) km = 300 km = 5 h Mr Li took 5 h to drive back.

  9. Distance Speed = Time 245 = km/h 5 A motorcyclist took 7 hours to travel from Town X to Town Y at an average speed of 35 km/h. A van took only 5 hours for the same journey. Find the average speed of the van. Distance between Town X and Y = Speed x Time = (35 x 7) km = 245 km The motorist’s speed was 49 km/h. = 49 km/h

  10. Distance Speed = Time Distance Time = Speed D S T It’s your turn to solve problems using the formula Distance = Speed x Time

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