4. 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.
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15 km is moved by the car between 8:30 and 8:50.
speed = distance/time = 15km / 20min = 0.705 km/min
If the car travels 15km in 20 minutes, and 20 minutes are a third of an hour, so the speed per hour is : (15km x 3)/(20min x 3) = 45km/60min, as 60min is an hour so it's equal to 45 km/hr
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