Question

Answer plz...only the one who know..i need solution..

Answer 1

Speed = Distance / time
Calculate all the distance fem point A,B &C
points
thn To find average speed

Add the total distance and ÷/ with the total time
Be care about changing the
Unit of speed and time like hours to sec
and km/h to m/sec

Answer 2

1st Distance=15km
1st Speed=30km/h
And 1st Time=x

2nd Distance=75km
2nd Speed=50km/h
And 2nd Time =x

3rd Distance=10km
3rd Speed=20km/h
And 3rd Time=x

Now,
$speed = \frac{distance}{time}$
$so \: \\ time = \frac{distance}{speed}$

$1time = \frac{d1}{s1} = \frac{15}{30} = \frac{1}{2} hrs$
$2time = \frac{75}{50} = \frac{3}{2}hrs$
$3time = \frac{10}{20} = \frac{1}{2} hrs$
Now,
$average \: speed = \frac{total \: distance \: }{total \: time \: taken}$
$= 15 + 75 + 10 + \div \frac{1}{2} + \frac{3}{2} + \frac{1}{2}$
=
$= \frac{100 \times 2}{5 }$
=40km/hrs