Question

solve this please as fast as possible​

Answer 1

Let the speed of the first car which 

starts from A = x km /hr

Speed of the second car which starts 

from B = y km / hr

We know that,
______________________
Time = distance / speed
______________________

Distance between two places A and 

B are 80km

d = 80 km

i ) if the cars move in same direction

Relative speed of them = ( x + y ) 

km/hr

Time = 8hr

d = 80km

8 = 80 / ( x + y )

x + y = 80 / 8

x + y = 10 ------( 1 )

ii ) if two cars moving opposite 

direction,

Relative speed = ( x - y ) km / hr

Time = 1 hr 20 minutes

= ( 1 + 20 / 60 ) hr

= ( 80/60) 

= 4/3 hr
d = 80km

4/3 = 80 / ( x -y )

x -y = ( 80 × 3 ) / 4

x - y = 60-----( 2 )

Add ( 1 ) and ( 2 ) , we get 

2x = 70

x = 35

Put x = 35 in ( 1 ) we get ,

y = 25

Therefore ,

Speed of the first car = x = 35km/hr

Speed of the second car = 25km /hr

I hope this helps you.

Answer 2

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