Speed and Acceleration

Question 11: Susan drives at an average speed of 105 km/h from town F to town G. The journey takes 3 hours. Susan takes 30 minutes longer for her return journey from town G to town F. Calculate the average speed, in km/h, for the return journey. Solution: Distance from F to G = 105 km/h×3 hours =315 km Average speed for return journey = distance travelled time taken … Read more

Question 9: Mr Wong is going to watch a movie at 2.30 p.m at a cinema that is 60 km away from his house. He leaves at 1.25 p.m and drives at an average speed of 70 km/h for half an hour. If he drives at an average speed of 75 km/h for the remaining … Read more

Question 7: Karen drives her car from town P to town Q at an average speed of 80 km/h for 2 hours 15 minutes. She continues her journey for a distance of 90 km from town Q to town R and takes 45 minutes. Calculate the average speed, in km/h, for the journey from P … Read more

Question 4: Table below shows the distances travelled and the average speeds for four vehicles. Vehicle Distance (km) Average speed (km/h) A 230 115 B 250 100 C 170 85 D 245 70 Which vehicles took the same time to complete the journey? Solution: Time taken for vehicle A= 230 115 =2 hours Time taken for vehicle B= 250 100 =2 1 2  hours … Read more

Question 1: The distance from town A to town B is 120 km. A car leaves town A for town B at 11.00 a.m. The average speed is 80 km h-1 . At what time does the car arrive at town B. Solution: Time taken= distance travelled average speed = 120 km 80  km h −1 = 3 2  hours … Read more