Question

Q.2
-
A car travels the first 20 km
with a speed of 40 km/h and
the next 40 km with a speed
of 80 km/h. Find the average
speed​

Answer 1

$\huge\underline\mathit{Given...}$

• v1 = 20km per hr
• v2 = 40km per hr

$\huge\underline\mathit{SoLution!!...}$

average speed = $\dfrac{total \: distance \: travelled}{total \:t ime \: taken}$

according to question...

• 40km + 80km = 120km

average speed = total distance / [ distance/ v1 + distance / v2 ]

since,...

time = distance / speed

average speed = 120/ ( 40/ 20 + 80/40)

= 120 / 20

= 60km

Answer 2

Answer:

60 kmph

Explanation:

avg. speed=total distance/total time=40+20/30+30=60/1= 60 kmph