Question

Points A and B are 90km apart from each other on a highway. A car starts from A and another from B at the same time. If they go in the same direction they meet in 9 hours and if they go in opposite directions they meet in 9 by 7 hours. Find their speeds. by crossmultiplication

Answer 1

Answer:

there speed will be the correspondence for each offfff

Answer 2

Answer:

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Step-by-step explanation:

Let speed of car which starts from A=xkm/hr.

Let speed of car which starts from B=ykm/hr

According to question:

90/x-y=9

9(x-y)=90

9x-9y=90

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

and,90/x+y=7

7(x+y)=90

7x+7y=90

x+y=90---------------(2)

Adding (1) and (2)

2x=100

x=50km/hr.

Putting value of x in (1), we get

x-y=10

50-y=10

y=5km/hr