Acar travels from point a to point b, moving in the same direction but with a non-constant speed. the first half of the distance, the car travels with a speed v 1 â.the remaining part of the way, the car travels half the time with a speed v2 ââand half the time with a speed v3 ââ . what is the average speed over the entire journey?

Explanation:

From A to B

distance traveled with velocity  in time

from B to C

distance traveled is 0.5 d with  and  velocity for half-half time

divide 1 and 2 we get

Now average velocity is given by

taking  common

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).