Question 897700
Mark drove to visit his grandma at 75km/hr. He returned at 50km/hr. It took 45 minutes longer to return home than to get to his grandmas house, how long dod it take him to get home?
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let x=travel time to grandma's house
x+45min=travel time to return home
distance=speed*travel time
..
45 min=45/60 hr=3/4 hr
75x=50(x+3/4)
75x=50x+37.5
25x=37.5
x=1.5
x+3/4=2.25
how long did it take him to get home? 2.25 hr