1.

How long would it take to travel 3 km at a speed of 15 m/s?

5 seconds

200 seconds

45 minutes

2 hours

3 km = 3,000 m so time = 3,000 m / 15 m/s = 200 s

2.

If distance is measured in miles and speed in mph, time is measured in .......

seconds

minutes

hours

None of these

When answering questions about speed, you need to pay close attention to the units and sometimes you will need to convert the units into something more suitable for carrying out the calculation

3.

A car travels at 70 mph. How long will it take to travel 210 miles?

20 minutes

2.1 hours

3 hours

7 hours

Time = 210 miles/70 mph = 3 hours

4.

How long would it take to travel 100 km at a speed of 50 km/h?

2 hours

60 minutes

5,000 seconds

5 hours

Time = distance/speed so 100 km / 50 km/h = 2 hours

5.

How long would it take to run 400 m at a speed of 5 m/s?

20 seconds

80 seconds

80 minutes

8 hours

Time = distance/speed so 400 m / 5 m/s = 80 s

6.

How long would it take to run 800 m at a speed of 8 m/s?

80 seconds

100 seconds

1 hour

100 minutes

Time = distance/speed so 800 m / 8 m/s = 100 s

7.

If distance is measured in kilometres and speed in km/h, time is measured in .......

seconds

minutes

hours

None of these

In many situations, it is easier to understand speeds in terms of km/h rather than m/s

8.

A cheetah runs at 100 km/h. How long will it take to run 100 metres?

1 second

0.001 hours

1 minute

1 hour

100 m = 0.1 km so time = 0.1/100 = 0.001 hours, 1 hour = 3,600 seconds so 0.001h = 3.6 seconds! The fastest humans take over 9 seconds to cover the same distance

9.

How long would it take to ride a motorbike 300,000 m at a speed of 60 km/h?

0.5 hours

5 hours

5,000 minutes

5,000 hours

300,000 m = 300 km so time = 300 km / 60 km/h = 5 hours. Light does it in 0.1 seconds!

10.

If distance is measured in metres and speed in m/s, time is measured in .......

seconds

minutes

hours

None of these

Seconds are the basic SI unit of time and for calculations involving speed, you often need to convert hours into seconds to get the correct answer

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