When does speedometer of a car start reading?

Q.  A speedometer typically has a threshold of about 15 km/hr. If the car starts from rest and accelerates, the speedometer will
- Published on 11 Sep 15

a. Starts reading from the moment the car starts
b. Starts reading when the speed reaches 15 km/hr
c. Starts reading when the speed reaches 30 km/hr
d. None of these

ANSWER: Starts reading when the speed reaches 15 km/hr

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