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Cambridge Secondary (7-9). Stage 8. MCE Science. Workbook - Unit 8: Forces and Motion - Question 8

Cambridge Secondary (7-9) · Unit 8: Forces and Motion

Question 8

May lives in Singapore. She is travelling to the Philippines to visit her uncle and aunt. She knows that it will be a long journey and that she must plan ahead. She made the following summary.

- Leave home and walk to the nearest bus stop: 1 km in 15 minutes.
- Take the bus to Singapore Changi Airport: 20 km in 45 minutes.
- Fly from Singapore to Manila, Philippines: 2400 km in 3.5 hours.
- Take a taxi from Manila Airport to her uncle and aunt’s house: 30 km in 1 hour.

Question illustration

Calculate May’s average speed as she travels from her home in Singapore to her uncle and aunt’s house in the Philippines. Use the steps below. First, use May’s travel summary to find the total distance May travelled. Include every part of her trip: walk, bus ride, flight and taxi ride. Next, calculate the total time May spent travelling. Finally, use the formula to find her average speed. Convert all times to hours; round all distances to the nearest kilometre.

Total distance: ___

Time walking: 15 minutes = 0.25 hours
Time on bus: 45 minutes = 0.75 hours
Flight time: 3.5 hours
Time in taxi: 1 hour

Total time: ___
Average speed = ___ ≈ ___ km/h
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