Question

A car moves at a cobstant speed of 60km/hr for 1km and 40km /hr for nrxt 1 km. What is the average speed of car

Answer 1

ʜᴇʟʟᴏ ᴍᴀᴛᴇ!

Let's see what values we have with us.

We have, speed 60 km/h and travels 1 km
Then its travels 1 km again by 40 km/h speed

So, what we don't have? Time!

Speed = distance / time

60 = 1 / t1

t1 = 1 / 60

40 = 1 / t2

t2 = 1 / 40

Averahe speed = Total Distance / Total time

= ( 1 + 1 ) km / ( 1/60 + 1/40 ) hr

= 2 km / ( 2 + 3 ) hr /120

= 2*120 / 5 km/h

= 48 km/h

Hope it helps

Answer 2

average speed=
$\frac{total \: distance \: travel}{total \: time \: taken}$
so,
d1= 1km
d2= 1km
speed1= 60km/h
speed2= 40km/h
so we do not have time so first find it by putting in eq 1
so , put in the formula
average speed =
$\frac{d1 + d2}{speed1 + speed2}$
$\frac{1km + 1km}{60 + 40}$
$= \frac{2km}{100}$
so 50km is the average speed