# Math

A student sarts for her school at the speed of 12 km / hr & reaches school 4 mins earlier than the asembily.next day she cycles at 10 km / hr & is late by 6 mins & missed assembly . Find distance b / w herschool & home

1. d/12 + 1/15 = d/10 - 1/10 ... 60 is LCD

5d + 4 = 6d - 6

posted by Scott
2. 12 km/hr * 1000 m/km * 1 hr/60 min = 200 meters/min

10 km/hr = 166.7 meters/min

distance = d

d = 200 (t-4) = 200 t - 800
d = 166.7(t+6) = 166.7 t + 1000

33.3 t = 1800
t = 54.1 minutes

d = 200(54.1) - 800 = 10,010 meters

= 10 km

check
200(54-4) = 10,000
167(54+6) = 10,000

posted by Damon
3. her time difference is 10 minutes, or 1/6 hour

since distance = speed * time, and is the same both days, if she took t hours the first day, we have

12t = 10(t + 1/6)
t = 5/6 hr, or 50 minutes

so, the distance is
12km/hr * 5/6 hr = 10km

posted by Steve

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