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Avantika completed her journey of 136 km in 6 h. A part of this journey was travelled at 15 km/h and the remaining part at 18 km/h. What part of the journey was travelled at 18 km/h?

1
by chinmayimatt

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by chinmayimatt

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x+y=136 -------------------- (1)

speed = 15 km/hr

time = hr

speed = 18 km/hr

time = hr

⇒

3(6x+5y)=1620

6x+5y= 540 -------------------------- (2)

now solve (1) and (2)