1.

A car covers 1/3 part of total distance with speed of 12 km/h , then second 1/3 part of total distance with speed 18 km/h and last 1/3 part of the total distance with speed 24 km/h . The average speed of car is​ ___please answer fast

Answer»

Answer
S
TOTAL
​
=S
1
​
+S
2
​
+S
3
​

S
1
​
=
3
S
​
V
1
​
=10kmh
−
1

S
2
​
=
3
S
​
V
2
​
=20kmh
−
1

S
3
​
=
3
S
​
V
3
​
=60kmh
−
1

∴t
1
​
=
V
1
​

S
1
​

​
=
3
S
​
×
10
1
​
=
30
S
​
h

t
2
​
=
V
2
​

S
2
​

​
=
3
S
​
×
20
1
​
=
60
S
​
h

t
3
​
=
V
3
​

S
3
​

​
=
3
S
​
×
60
1
​
=
180
S
​
h

∴V
any
​
=
total TIME taken
total distance
​


=
30
S
​
+
30
S
​
+
30
S
​

s
​
=
180
6S+3S+S
​

S
​


=
10S
180S
​


Ans) 18km/ph


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