Question related to graphs - IGCSE MATHEMATICS  Please answer me Question # 1, Exercise 11 on Page 230 from following link...

Question related to graphs - IGCSE MATHEMATICS

 

Please answer me Question # 1, Exercise 11 on Page 230 from following link

http://tstuition.wikispaces.com/file/view/7+-+Graphs.pdf/78425265/7%20-%20Graphs.pdf

many thanks in advance

Expert Answers
beckden eNotes educator| Certified Educator

(a) 45 minutes

(b) 9:15

(c) 30 miles in 1/2 hour = 60 miles/hr

(d) The maximum speed is when the distance traveled divided by the time is the greatest. This occurs when the slope of the line is the steepest. We can see by the graph that this happens between 11:15 and 12:15.

(e) To find the average speed we take the total distance traveled, 200miles(100miles there and 100 miles back) and divide by the amount of time taken (3.5 hours). Dividing 200/3.5 gives us 57.1428miles/hr.