Question

The odometer of a vehicle has an initial reading of 1000 km. After the trip, it shows a reading of 1540 km. If the time taken for the trip is 5 hours, what is the average speed of the vehicle in $m{s}^{-1}$?

• A. 10
• B. 20
• C. 30
• D. 40

Answer 1

The correct option is C 30

Initial reading of the odometer = 1000 km

Final reading of the odometer = 1540 km

Distance covered by the car = Final reading of the odometer – Initial reading of the odometer

= 1540 - 1000 = 540 km = 540 x 1000 m = 54000 m

Hence, time taken = 5 hr = 5 x 60 x 60 s = 18000 s

Average Speed = $\frac{Dis\tan ce}{Time}=\frac{540000}{18000}=30m{s}^{-1}$

Thus, the average speed of the vehicle is $30m{s}^{-1}$.