S.chand publication New Learning Composite mathematics solution of class 8 Chapter 15 Line Graphs Exercise 15C

 Exercise 15C

Question 1

Sol :

(i) Ans -> d

Because we see from the graph that the X axis plot time & Y axis distance. We know that, Speed = P/T

So, we see in the graph, at different time the car was travelling same distance. So, the speed of the car is contract & the stopped.

(ii) Ans -> C

Because, speed = dis/time We see in the picture(c) that when the time is gradually increasing, the car travelling more distance with respect to time.

(iii) Ans -> b

Because what the car is going in certain speed then it take some distance but when increase the speed it takes more distance that we see in the Pie ‘b’ _____ the time of Y axis (Dis) increase when the speed increase

∴ Dis = velocity x Time

(iv) Ans -> (d)

Because X axis plot time Y axis plot distance. We know speed = P/T

In this picture at different time the car was travelling same distance.

Question 2

Sol :

(a) 1 sq represent horizontally – 100m

1 sq represent vertically – 10 m

(b) 10 min

(c) Speed = 1000/10 = 100 m/min

(d) (35 min + 45 min)

= 80 min

(e) whole flight take  130 min

Question 3

Sol :

(a)

(i) 90 m

(ii) (6 + 2 + 1)

= 9 am

(iii) (6 am + 2h + 1 h rest  + 2h)

= 11 am

<figure to be added>

Question 4

Sol :

(a) 5.30 am

(c) Forward Journey

(d) He did not more = (2hr 30 min + 3h)

= 5 h 30min

(e) 1 (pm)

Question 6

Sol :

(a) 40 km

(b)

(i) 30 km

(ii) 46 km (approximately)

(c) 10:30 am

(e)

(i) Sanjay

(ii) Sanjay

(f) 50 km

(ii) 30 km