Question

Q13. What does the odometer of an automobile measure? Which of the following is moving faster? Justify your answer.
a) A scooter moving with a speed of 300 m per minute.
b) A car moving with a speed of 36 km per hour.

Answer 1

it measures the speed of automobile
speed of car is more

Answer 2

An odometer measures the distance travelled by any automobile.

Out of the two,i.e. the car and the scooter, the car(b) is moving faster.

This can be explained as follows:

In order to compare the speed of both the vehicles and determine which one is moving faster, the speed of both the vehicles should be represented by the same unit.

Speed of scooter = 300 m/min

Converting this to km/hr,

Distance travelled by the scooter in 1 min= 300 m

Therefore, distance travelled by the scooter in 60min( or 1 hr ) = 18000m = 18 km

Speed of the car= 36 km/hr

Since the car travels a greater distance in 1 hr , we can say that it is moving faster.