fojia ali

## Math question !?

2019-06-29 21:56:39

Mark is riding his bike east at a steady 10km/hr, while Stacey is riding her bike west at a steady 8km/hr. They pass each other on a bridge at 12 noon (12pm)

Assuming that east is the positive direction and west is the negative direction and that time before noon is negative and after noon is positive.

What is the location of each person with respect to the bridge at 9am?

What is the location of each person with respect to the bridge at 2pm?

How far apart are they at 10am?

TIA everyone! Really struggling at the moment to visualise such a problem!

2019-06-29 21:56:39

Elbord John

John Watson

What is the location of each person with respect to the bridge at 9am?

This is simply speed x time. The only confusion is the sign of position. Taking position and time at noon being zero:

v x t = p (position)

For mike: 10km/hr x (-3hr) = -30km which means 30 km west

For Stacey: (-8km/hr) x (-3hr) = +24 km or 24 km east.

Get a ruler in your hands. Measure things until you start to understand how a ruler works. Measure some stuff and figure out where the center is. Say you measure a book and it's 7/8" thick. You look at your ruler and see that every eighth is divided into two sixteenths, so obviously half of 7/8" is going to be 7/16". If you write that out you have 1/2 x 7/8 = 7/16. And you notice that 1/2 is divided into 2/4 and then into 4/8 and so on, so you can convert anything to anything by multiplying all the numbers on top and then all the numbers on bottom.

Other rulers are divided into 10 and 100 parts. But an inch is still an inch, so anything on one ruler can be translated to the other ruler. A half inch on one ruler is 5/10 or 50/100 on the other. An eighth inch is just 12.5 marks when you have 100 marks per inch. A metric ruler divides an inch into 25.4 parts, so a half inch would be 12.7 of those parts. Pretty simple, isn't it? Practice this a bit and people will think you went to wizard school.

2019-06-29John Watson

This is simply speed x time. The only confusion is the sign of position. Taking position and time at noon being zero:

v x t = p (position)

For mike: 10km/hr x (-3hr) = -30km which means 30 km west

For Stacey: (-8km/hr) x (-3hr) = +24 km or 24 km east.

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