Distance - time graph and speed starter

The distance-time graph shows class 8A’s journey to the zoo.

They stopped for a picnic on the way to the zoo

a. What time did the bus leave school?

b. What time did they stop for a picnic?

c. How far had they travelled when they

stopped for a picnic?

• 10 miles

• 30 miles

• 50 miles

• 70 miles

How long did they stop for?

• 1/2 an hour

• 1 hour

• 2 hours

• 3 hours

What time did they arrive at the zoo?

• 10:00

• 10:30

• 11:00

• 11:30

How far is the zoo from school?

• 60 miles

• 75 miles

• 100 miles

• 90 miles

Erin leaves home at 11am.

She cycles at a speed of 16 miles per hour for 90 minutes.

She stops for half an hour.

Erin then cycles home and arrives at 3pm.

(a) Draw a distance-time graph to show Erin’s journey.

(b) What is Erin’s average speed on the

return part of her cycle?

Answer explanation

At the beginning of the her journey

distance = 0 at time 11:00

then she moved in speed = 16 mile/h

for 90 min

a. convert min to hours so 90/60 = 1.5 hours

so she began at 11:00 and kept moving 1 hour and a half so the time is 12:30

b. calculate the distance

d= speed X time

= 16 X 1.5

= 24

so for the second point distance= 24

time= 12:30

then third she when home at 3:00

so back to x axis at 3:00