Question

a car travels 300 km in 5 hours calculate its speed in metre per second square universe

Answer 1

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Given,
Distance = 300 km 
Time = 5 hr
Speed = ???

We know,
Speed = distance/time
           = 300/5
           = 60 km/hr

Now, convert in m/s:
1km = 1000m 
1 hour = 3600 seconds 

Then,
60 km/hr 
= 60000 m/3600 s 
= 20 m/s

Answer 2

Speed and Time

Distance traveled by car $= 300 \ km$

Time taken to travel this distance $= 5 \ hours$

As we know that ,

$\frac{distance \ covered}{time \ taken} = speed$

$\implies \frac{300}{5} =60\ km/hour$

As per demand of question we need to convert this speed in meter/ second.

$1 \ km = 1000\ m\\and \\1 \ hour= 60\ minutes\\1\ minute = 60 \ seconds\\So,\\1\ hour = 3600 \ seconds$

Conversion,

$60\ km/hr= 60\times [\frac{1000}{60\times 60} ]meter/second$

$\implies 60 \ km/hr=\frac{50}{3}m/sec = 16.66\ m/s$

Hence, 16.66 m/s is the required speed of the car.