At 9:00 Kate leaves her home and drives at a speed of 80km/h. At 9:30 she increases her speed to 100km/h and continues her destination which is 90km from home. continuation......

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First she drives at a speed of 80km/h for half an hour. So she travels 40 km.Then her speed increases to 100km/hSo the remaining 50 km , she will take half an hour.(her speed now is 100km/hr)She stops for 3/4 hourSo far she has taken 1and3/4 hour.While coming back, she takes one hour (her speed is 90 km/h)So tatally she takes 2 and 3/4 hourSo she will return at 11.45 (Is it am or pm?)For a position -time graph  draw a st line with a slope of 80 for 1/2 hour , then steeper slope of 100 for 1/2 hour and then horizontal line ( resting) for 3/4 hour and then negative slope of 90 and reach the original position,