PhysicsThe odometer of a car reads 57321 km when the clock shows the time 08:30 AM, if at 08:50 AM, the odometer reading is changed to 57336 km then the speed of the car is ____ km/hr.

The odometer of a car reads 57321 km when the clock shows the time 08:30 AM, if at 08:50 AM, the odometer reading is changed to 57336 km then the speed of the car is ____ km/hr.


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    Solution:

    The odometer of a car reads 57321 km when the clock shows the time 08:30 AM, if at 08:50 AM, the odometer reading is changed to 57336 km then the speed of the car is 45 km/hr.
    “Speed is defined as the ratio of distance covered by a body to the time taken by the body to cover that distance.” The distance covered by the body is,
         d =57336-57321
    ⇒d =15 km
    The time taken by the car is,
         t=08:50-08:30
    ⇒t=20 min
    ⇒t=2060
    ⇒t=13 hr
    The speed of the car is equal to,
         Speed=DistanceTime
    ⇒Speed=1513
    ⇒Speed=15×3
    ⇒Speed=45 km/hr
    The speed of the car is 45 km/hr.
     

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