Question

a cars travels with speed of 30 km/h for 30 min and then with speed 40 km/h for 1 hour find:
1. The total distance travelled by the car
2. The total time of travel
3. The average speed of car​

Answer 1

Explanation:

1.

1st case

speed=30km/he

time= 1/2hrs

speed=distance /time

30=distance×2

distance =15km

2nd case

speed=40km/hrs

time=1hr.

speed=distance/time

40=distance/1

distance =40km

therefore, total distance =15+40

= 55km

2. total time:

1/2 hrs + 1 = 3/2 hrs. or 1.5 hrs.

3. Average speed,

Total distance/total time

55/1.5

36.6 km/hr