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Question 5

The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also.

Answer

Initial reading of the odometer of the car = 57321.0 km
Final reading of the odometer of the car = 57336.0 km

The car starts at 8:30 AM and stops at 8:50 AM
Distance covered by car = (57336 - 57321) km = 15 km



Time taken between 8:30 AM to 8:50 AM = 20 minutes =20/60 hour = 1/3 hour

So speed in km/min
Speed = Distance travelled
                           Time

=15 km / 20 min
0.75 km/ min

Speed in km/h
Speed = Distance travelled
                          Time

= 15 km/ 1/3 h
= 15 x 3 km/ 1 h
= 45 km/h

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