Question

Numericals
1. A car takes 20 minutes to cover a distance of 15 km. Calculate its speed in km/h and m/s.
2. The distance between two towns is 400 km. How much time would it take a car to cover this
distance at an average speed 50 km/h?
3. A man driving at an average speed of 40 km/h takes 6 hours to travel from one town to another.
What is the distance between the towns?
4. Plot a distance-time graph for a body travelling at a speed of 2.5 m/s.​

Answer 1

Answer:

1. 45km/hr and 12.5m/s

2.8 hours

3. 240km

Explanation:

1.

(i)km/hr

speed = distance/time

distance =15km

time = 20mins = 20/60hrs = 1/3hrs

therefore,

speed = 15/1/3 = 15*3

= 45 km/hr.

(ii)m/s

speed in km/hr = 45km/hr.

thus,

speed in m/s = 45*5/18 = 25/2[multiplying speed in km/hr with 5/18 gives speed in m/s.]

= 12.5m/s

2.

speed = distance/time.

so, time = distance/speed.

distance = 400km

speed = 50km/hr

therefore,

distance = 400/50

= 8hrs

3.

speed = distance/time

so, distance = speed*time

speed = 40km/h

time = 6hours

therefore,

distance = 40*6

= 240km

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