Point A and Point B are 120 m apart. Point B and Point C are 300 m apart. Ben ran from Point A to Point B in 15 seconds. Then, he runs from Point B to Point C in 55 seconds. Find Ben’s average speed for the distance from Point A to Point C.
Total distance from Point A to Point C = 120 + 300 = 420 m
Time taken to run from Point A to Point C = 15 + 55 = 70 s
Ben’s average speed is 6 m/s.
Pauline swam for 100 seconds at a speed of 2.5 m/s. Then, she swam for another 100 seconds at a speed of 1.5 m/s. Find Pauline’s average speed.
For the first part,
Distance swum = 2.5 × 100 = 250 m
For the second part,
Distance swum = 1.5 × 100 = 150 m
Total distance swum = 250 + 150 = 400 m
Total time taken = 100 + 100 = 200 s
Average speed = 400 ÷ 200 = 2 m/s
Pauline’s average speed was 2 m/s
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