7) A car moves with a speed of 90km/h for 20min and then with a speed of
60km/h for the next 15 min. Find the total distance covered by the car during
its whole journey?
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Explanation:
Distance = Speed × time
For first part
- Speed = 90 km/h = 25 m/s
- Time = 20 min = 1200 s
- Distance = 25 × 1200
= 30000 m = 30 Km
For second part
- Speed = 60 km/h = 16.66 m/s
- Time = 15 min = 900 s
- Distance = 16.66 × 900
= 14994 m = 14.994 Km
Total Distance = 30 + 14.994 = 44.994 Km
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