1. Distance Speed Time
Thursday, 22 November 2018

2. Example
Find the time taken for the following journeys:
100km at a speed of 20 km/h
250 miles at a speed of 50 mph
15 metres at a speed of 20 cm/s
metres at a speed of 10 m/s
𝑇𝑖𝑚𝑒= 𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑆𝑝𝑒𝑒𝑑

3. Example
Find the speeds of the bodies which move as follows:
A distance of 600 km in 10 hours
A distance of 35 km in 7 hours
A distance of 45 metres in 10 seconds
A distance of 500m in 10 minutes (units m/s)
𝑆𝑝𝑒𝑒𝑑= 𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑇𝑖𝑚𝑒

4. Example
Find the distance travelled for each of the following:
At a speed of 45 mph for 2 hours
At a speed of 40 km/h for 15 minutes
At a speed of 15m/s for 6 seconds
At a speed of 15m/s for 1 hour
𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒=𝑆𝑝𝑒𝑒𝑑×𝑇𝑖𝑚𝑒

5. Calculations involving these three quantities are similar and can be easily remembered through the following triangle
𝐷=𝑆×𝑇 D
𝑆= 𝐷 𝑇 S T
𝑇= 𝐷 𝑆
Example
A train travelling at an average 50 mph takes 4 hours to travel from Leeds to London.
Find the distance between the two stations.

6. Example
The Spine-tailed swift is the fastest bird in powered flight, with a top recorded speed of 171km/h.
How far can the swift fly in 3 hours?

7. Example
Virgin Atlantic flies from Manchester to Orlando, a distance of 4229 km in approximately hours.
Find the average speed for the whole trip

8. Example
The cheetah is designed for running down fast prey and can reach a top speed of 113km/h.
How far will a cheetah travel in
30 mins
10 mins?

9. Example
American Quarter Horses are the fastest horses in the world. Able to run at high speeds, they can travel a quarter mile in less than 21 seconds, starting from a flat-footed standstill.
What is there average speed?

10. Example
Trent Grimsey holds the record for swimming the English Channel, a distance of 21 miles.
His average speed was approximately 3 mph.
How long did it take him to complete the swim?

11. Example
In Horse racing, Hawkster covered 2.414km with an average speed of km/h.
How long did it take to complete the race?