Question

The odometer of a car reads $57321.0km$ when the clock shows the time 8:30 AM. The distance moved by car if, at 8:50 AM, the odometer reading has changed to $57336.0km$ and also the speed will be:

• A. $15km,45km/h$
• B. $10km,$ $45km/h$
• C. $15km,$ $55km/h$
• D. $20km,$ $45km/h$

Answer 1

Answer: (A)

$15km,45km/h$

Time from $8.30$ $AM$ to $8.50$ $AM$ = $20$ $min$

$20min=\left(20/60\right)h=\left(1/3\right)h$
=2060h=13h

(a) Distance covered = Second reading - First reading = $57336.0$ $km$ - $57321.0$ $km$ = $15$ $km$

(b) $Speed=\frac{Distance}{Time}$=$\frac{15}{1/3}$=$45km/h$