Science, asked by princesharma68274, 8 months ago

two cars a and b starting at the same time from the same point )are moving with average speed of 70km /hr and 90km/hr respectively in the same direction find how much far will car b be from car a after 5 hrs​

Answers

Answered by kavyalood
2

When they travel in same direction, suppose

they meet when B travels for x m, then A will have travelled 70+x

m in the same time

Since, Speed =  

Time

Distance

​  

 

Speed of car at A =  

7

x+70

​  

 

And Speed of car at B =  

7

x

​  

 

And when they travel in the opposite direction, suppose they meet when A

travels for y m, then B will have travelled 70−y m in the same

time

Speed of car at A =  

1

y

​  

=y

And Speed of car at B =  

1

70−y

​  

=70−y

Equating the speeds of the cars in both the cases,

Speed of car at A,  

7

x+70

​  

=y

x+70=7y

=>x−7y=−70 --- (1)

Speed of car at B,  

7

x

​  

=70−y

=>x+7y=490 --- (2)

Adding equations 1 and 2, we get 2x=420=>x=210

So, Speed of car at A =  

7

x+70

​  

=  

7

280

​  

=40km/hr

Speed of car at B =  

7

x

​  

=  

7

210

​  

=30km/hr

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