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Find the distance covered by a car moving at 20 m/s for 3h.
A) 220 km
B) 218 km
C) 216 km
D) 230 km

Answer
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Hint: Here first assume the distance covered by the car to be x
Then we will use the formula for speed and evaluate the value of distance x.
The speed is given by:-
speed=distancetime

Complete step-by-step answer:
Let the distance covered by the car be x
Now we are given that:-
Speed of the car is 20 m/s
The time taken by the car is 3 hours.
Since the time is given in hours and speed is given in m/s so we need to make the unit of time the same.
Hence in order to make the unit same, we will convert hours into seconds
Now since we know that:-
1hr=60min and 1min=60sec
Therefore,
1hr=60×60sec
Hence 3hr will be equal to:-
3hr=3×60×60sec
Calculating the value we get:-
3hr=10800sec
Now we know that the speed is given by:-
speed=distancetime
Hence putting in the respective values we get:-
20=x10800
Now evaluating for the value of x we get:-
x=20×10800x=216000m
Therefore, the distance covered is 216000 m
Now we will convert this distance into kilometers.
We know that:
1km=1000m1m=11000km
Hence 216000m will be equal to:-
216000m=2160001000km
Calculating the value we get:-
216000m=216km
Hence the distance covered by the car is 216 km

So, the correct answer is “Option C”.

Note: Students can also convert the speed from m/s to km/hour and then put the respective values in the formula for speed to get the value of distance covered.
1m/sec=185km/hr