J's answer to Dylan's Secondary 1 Maths Singapore question.
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d = 240 - 80t
When d = 40,
40 = 240 - 80t
80t = 240 - 40
80t = 200
t = 200/80
t = 5/2 = 2½
When the train reaches the station, d = 0 because they is no more distance between them.
So, 0 = 240 - 80t
80t = 240
t = 240/80
t = 3
When d = 40,
40 = 240 - 80t
80t = 240 - 40
80t = 200
t = 200/80
t = 5/2 = 2½
When the train reaches the station, d = 0 because they is no more distance between them.
So, 0 = 240 - 80t
80t = 240
t = 240/80
t = 3
Date Posted:
3 years ago
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