# To find Speed when Distance and Time are given

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.