3x-o-(-1)-12-2x-6-1x-12-2x-1-1x3Ă.30 24 -1x 30 and y 24.Putting the

1.	3x-o-(-1)-12-2x-6-1x-12-2x-1-1x3Ă.30 24 -1x 30 and y 24.Putting the values of x and y in equation (i), we obtainDistance(30 x 24) km- 720 km.Hence, the length of the journey is 720 km.EXERCISE 3.10LEVEL-1I. Points A and B are 70 km. a part on a highway. A car starts from A and another carstarts from B simulataneously. If they travel in the same direction, they meet in 7hours, but if they travel towards each other, they meet in one hour. Find the speed ofCBSE 2002]the two cars.
Answer» A.____________.B Distance between A & B is 70km. ←A & ← B both travel in same direction. but their speed is not the same. So they both meet after 7 hours. let the speed of A be x and B be y. if they travel towards each other →← they meet in 1 hour. when they are moving in same direction ,the speed is x-y. when they are moving towards each other,the speed is x+y. Distance = 70km 7(x-y)=70 x-y=10---›(i) similarly 1(x+y)=70 x+y=70---›(ii) Solving (i) & (ii) x+y=70x -y=10_____2x=80. x=80/2=40 Km/ hr. substitute x in x+y=70 so,40+y=70;y=30 km/hr. The speed of Car A is 40km/hr. The speed of Car B is 30 km/hr. Hit like if you find it useful

3x-o-(-1)-12-2x-6-1x-12-2x-1-1x3Ă.30 24 -1x 30 and y 24.Putting the values of x and y in equation (i), we obtainDistance(30 x 24) km- 720 km.Hence, the length of the journey is 720 km.EXERCISE 3.10LEVEL-1I. Points A and B are 70 km. a part on a highway. A car starts from A and another carstarts from B simulataneously. If they travel in the same direction, they meet in 7hours, but if they travel towards each other, they meet in one hour. Find the speed ofCBSE 2002]the two cars.

Answer»

A.____________.B

Distance between A & B is 70km.

←A & ← B both travel in same direction.

but their speed is not the same. So they both meet after 7 hours.

let the speed of A be x and B be y.

if they travel towards each other →← they meet in 1 hour.

when they are moving in same direction ,the speed is x-y.

when they are moving towards each other,the speed is x+y.

Distance = 70km

7(x-y)=70

x-y=10---›(i)

similarly

1(x+y)=70

x+y=70---›(ii)

Solving (i) & (ii)

x+y=70x -y=10_____2x=80.

x=80/2=40 Km/ hr.

substitute x in x+y=70

so,40+y=70;y=30 km/hr.

The speed of Car A is 40km/hr.

The speed of Car B is 30 km/hr.

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