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.

#### Solution

Initial reading of the odometer of the car = 57321.0 km

Final reading of the odometer of the car = 57336.0 km

Distance covered by the car

= Final reading of the odometer of the car − Initial reading of the odometer of the car

= 57336.0 − 57321.0 = 15 km

The given car starts at 8:30 a.m. and stops at 8:50 a.m.

Therefore, time taken by the car to cover the distance is (8:50 − 8:30) min = 20 min

Distance covered by the car = 15 km

Time taken by the car = 20 min

Speed = `"Distanc covered"/"Time taken" = 15/20 = 0.75 km/min`

Again

60 min = 1 h

20 min = `1/60 xx 20 = 1/3 h`

Time taken by the car = `1/3 h`

Speed = `"Distance covered"/"Time Taken" =15/(1/3) = 45 "km/h"`