2. If the speed of a car is increased by 10 km
per hr, it takes 18 minutes less to cover a
distance of 36 km. Find the speed of the car.
Answers
Answered by
1
Answer:
30km/hr
Step-by-step explanation:
Let speed of the car be x km/hr.
So,
x
36
−
x+10
36
=
60
18
⇒36(
x
1
−
x+10
1
)=
60
18
⇒
x
1
−
x+10
1
=
120
1
⇒
x
2
+10x
x+10−x
=
120
1
⇒
x
2
+10x
10
=
120
1
⇒x
2
+10x−1200=0
⇒x
2
+40x−30x−1200=0
⇒(x+40)(x−30)=0
Hence x=30km/hr
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