Question

Help?
3.) Ellen works for a high-speed rail company that wants to develop a new rail line. Ellen’s project is to find a train that is the second fastest in the world. The Shinkansen Bullet Train in Japan is reported to go as fast as 320 kilometers per hour. The TGV train in France can reach speeds of 89.44 meters per second. Explain to Ellen how to find what speed her new train must go to be the second fastest in this group. Then, find an appropriate speed for Ellen’s train in miles per hour and use the formula distance = speed • time to find how far the train can go in 2.5 hours.

Answer 1

You must find the spreed of BOTH trains in MILE PER HOUR. Explain to Ellen how to find what speed her new train must go to be the second fastest in this group. Then, find an appropriate speed for Ellen’s train in miles per hour and use the formula distance = speed • time to find how far the train can go in 2.5 hours

Answer 2

Well, do it.

\(\dfrac{320\;km}{1\;hr}\cdot\dfrac{0.621371\;mile}{1\;km}\) That one is almost done. You finish this up and then do the other one.

Answer 3

multiple that?

Answer 4

Look at the units. Most importantly, km/km leaves you with mile/hr. Are you suggesting you have never seen this, before?

Answer 5

0.621371 mi / 1 km = 1 -- It does not affect the value of the original expression. It just changes the units.

Answer 6

I have all of the converted to km i'm just confused on how to do this part : Then, find an appropriate speed for Ellen’s train in miles per hour and use the formula distance = speed • time to find how far the train can go in 2.5 hours

Answer 7

What did you get for the speeds of the two trains in mph? And how did you get it?

Answer 8

i have it converted to km not mph lol. I'm working on that part now .

Answer 9

now i have it converted to miles

Answer 10

What did you get?

320 kilometers per hour = ?? mph
89.44 meters per sec = ?? mph

Answer 11

320 Km = 198.839mph and 321.98 = 200.069mph

Answer 12

well 89.44 = 200.069 miles

Answer 13

Very good. Now what?

Answer 14

So, 198.839 mph < Ellen < 200.069 mph ?

Answer 15

okay, but what i'm confused on is they want me to fiind a speed for her and then tell them how far it goes in 2.5 hours

Answer 16

Agreed. That is a little confusing. I think it just needs to fall in that range. Just pick a speed. 200 mph? 199 mph? 199.438 mph? Just don't pick 198 mph or 201 mph.

Multiply what you select by 2.5 and you're done.

Answer 17

okay, I just hope I get it right tho i've had to go back multiple times and redo this and I can never understand it. >.< but thank you!

Answer 18

Nothing like a confusing question to make your life worse. Good luck.

Answer 19

what was the answer