Question #a2b1c

1 Answer
Alan P.
Apr 20, 2016

a) The girl will arrive before curtain time.
b)enter image source here

Explanation:

Total distance to be traveled:
color(white)("XXX")1000 m + 1700 m = 2700 m
Time until curtain opens:
color(white)("XXX")8" min" = 480" sec."

Period 1
Car travels 1000" m" at (25" m")/"sec"

Time taken:
color(white)("XXX")1000" m"xx"sec"/(25" m") = 40 " sec."

Period 2
Car waits at traffic light for 1.5" min" = 90" sec."
(Total time: 40+90=130 " sec.")
(Distance traveled this period: 0)
(Total distance traveled: 1000" m")

Period 3
Car travels 1700" m" at (10" m")/"sec"

Time taken:
color(white)("XXX")1700" m"xx"sec"/(10" m")=170 " sec."
(Total time: 40+90+170 = 300 " sec")
(Distance traveled this period: 1700" m")
(Total distance traveled: 1000 + 1700 = 2700" m")

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