Question

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 1

Initial reading of the odometer of the car = 57321.0 km

The 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, the 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 = `"Distance 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.