Homework Help: Math

Posted by Charu on Tuesday, May 1, 2012 at 10:21am.

Arman walks to the train station at 5 Km/h. He misses his train by 1 min. If he had run at 10 Km/h, he would have had 2 min to spare. How far is it to the station?

Math - Steve, Tuesday, May 1, 2012 at 10:51am
time = distance/speed

he took 3 minutes (3/60 hr) longer to walk than to run, so

d/5 = 3/60 + d/10
d/10 = 3/60
d = 1/2

check:
it takes 6 min to run 1/2 km at 5km/hr
it takes 3 min to run 1/2 km at 10km/hr

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