Question

*MOTION IN A STRAIGHT LINE *
A car travels the first third of a distance with a speed of 10kmph, the second third at
20kmph and the last third at 60kmph. What is its mean speed over the entire distance:
_11​

Answer 1

Answer:

30 kmph

Explanation:

since all the speeds covered are for equal distance. i.e., for one-third of the distance,

average of all the three speeds give us the mean speed of the vehicle.

mean speed = (speed1 + speed2 + speed3) / 3

                    = (10+20+60)/3

                    = 90/3   =  30 kmph.