Question

.A car moves with a speed of 30km/h for half- an- hour; 25km/h for 1 hour and 40km/h for 2 hour. What is the average speed of the car?​

Answer 1

Answer:

34.28km/hr

Explanation:

1. 30km/hr for 1/2hr so 30/2 =15km

2. 25km/hr for 1hr so 25 km

3. 40km/hr for 2 hr so 40×2=80 km

15+25+80=120km

now we have total distance,,

1/2 hr+1hr+2hr= 3 1/2 hr = 7/2 hr

now we have total time,,,,

average speed= total distance/total time taken

120/7/2 = 120×2/7 = 240/7= 34.28km/hr

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