To find speed when distance and time are given in different units the following conversion are:

1 km = 1000 m

Or

1 m = 1/1000 km

1 hour = 60 minutes

Or

1 minute = 1/60 hrs

1 minute = 60 seconds

Or

1 second = 1/60 minutes

**For Example:**

**1.** The speed of train is 60 km/hr; find its speed in metres per second.

Solution:

According to the problem, we know the speed of the train is 60 km/hr.

Distance covered in metres;

1 km = 1000 m

Therefore, 60 km = 60 × 1000 m

60 km = 60000 m

Time taken in seconds;

1 hr = 60 minutes;

1 minutes = 60 seconds

Therefore, 1 hr = 60 × 60 sec

1 hr = 3600 sec

**Speed = (Distance )/(Time )**

= 60000/3600 metres per second

= 16 2/3 metres per second

**2.** A car travels at a speed of 25 metres per second. Find its speed in km per hour.

Solution:

Distance travelled in 1 sec = 25 metres

Distance travelled in 1 hr = 25 × 3600

1 metre = 1/1000 km

= (25 × 3600)/1000 km

= 90000/1000 km

= 90 km

**Express Speed in Different Units**

**To find Speed when Distance and Time are given. **

**To find the Distance when Speed and Time are given.**

**To find Time when Distance and Speed are given.**

**Worksheet on Expressing Speed in Different Units**

**Worksheet on Speed, Distance and Time.**

**5th Grade Math Problems**

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