Question

A car moving on a straight road covers the half
of the total distance with 36 km/h and the rest
with 54 km/h, the average speed of car is
O 9 m/s
O 12 m/s
O 27 m/s
O 18 m/s​

Answer 1

Answer:

it will be 12 metre per second

Step-by-step explanation:

option b

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Answer 2

given, car travels half distance with speed =36km/h

and the rest distance with 54 km/h.

we have to find the average speed of the  car

Step-by-step explanation:

"average speed = (total distance) /( total time)"

=$\frac{d1+d2}{t1+t2}$

=$\frac{x+x}{(x/36)+(x/54)}$

=$\frac{2x}{x(1/36+1/54)}$

=$\frac{2}{5/108}$

=216/5

=43.2 km/h

=43.2×5/18

=12 m/s

Hence, the average speed of car is 12m/s