a car travels first 40km at a speed of 30km/h the next 60km are covered at 36km/h and the final 80km at 40km/h what is the average speed attained by the car overthe journey
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average speed = distance travelled /time taken
we know here speed and distance is given only so to find average speed we need to find its time
speed=ditance/time
30=40/t
t=40/30=1.33hr
similarly
36=60/t
t=60/36=1.66hr
and
40=80/t
t=80/40=2hr
now add distance travelled and time taken and divide them
40+60+80=180km
time=1.33+1.66+2=4.99hr
average speed = 180/4.99=36.07km/hr
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