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.
Worksheet on Expressing Speed in Different Units
Worksheet on Speed, Distance and Time.
5th Grade Math Problems
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