The odometer reading of a moving car at `8.00` am is 36540 km and at `10.00` am 36666 km . If the car is moving on a z0g -zag path with variable speeds , its average speed ( in m/s) is

Options

A. `17.5`
B. 35
C. `6.3`
D. `12.6`

Answer

A

Explanation

Total distance travelled = (Final reading of odometer ) - (Intial reading of odometer )
` = 36666 - 36540 = 125` km
Total time taken `10 : 00 - 8:00 = 2h`
Average speed of car
`=("Total disatnce travelled ")/("Total time taken ") `
`S = 126/2 = 63 `km/h
` rArr " " S = 63 xx 5/18`
` = 35/2 = 17.5 ` m/s