Question

Create an expression to find the time for the given distance and rate, and find the value of the expression.
https://static.k12.com/bank_packages/files/media/mathml_39d1d75600ff3d66263a6c83d92a7bc554d286f1_1.gif

Answer 1

time = distance/speed

t= d/s { d= 315km, t = 35 km/hr ]
substitute the values in above equation

Answer 2

that makes no sense to me

Answer 3

do u want find time or not

Answer 4

yes

Answer 5

@cooldude12: dayakar's attempt to help you is correct and valid. "distance equals rate times time" is a basic fact in algebra and physics. d = r*t can be re-written as t = d/r.
I urge you to go back to what dayakar has written and think about it. If you still don't understand, then ask questions for clarification.

Answer 6

\[t = \frac{ 315 km }{ 35 km/hr}\]

t = 9 hr

Answer 7

so I was supposed to divide 315 by 35?

Answer 8

You're looking for time t, right? if (distance) = (rate)(time), and you want to find time, t,
what do you do to obtain a formula for t?

Answer 9

is it clear , u have to understand problem first
what is given
and what we have to find out?

Answer 10

t=d/s?

Answer 11

Given d=r*t, solve for time, t. t=?

Yes, it's t=d/s.

Now, what is the given d?
What is the given s?

What do you do with these measurements, to find t?

Use your own formula: t = d / s

Answer 12

t = 315/35, right?

Answer 13

Yes, but where are y our units of measurement? 315 what? 35 what?

t = ??

Answer 14

time = 315km/35kmh

Answer 15

right?

Answer 16

Yes, good work.

Now reduce this:\[t=\frac{ 315 km }{ 35\frac{ km }{ hr } }\]

Answer 17

Reduce this \[t=\frac{ 315km }{ 35\frac{ km }{ hr } }\]

Answer 18

\[t = \frac{315}{35} = 9\]

Answer 19

so t = 9

Answer 20

@mathmale

Answer 21

Your '9' is correct. But still you're not including the units of measurement. Such units are mandatory, not optional.

Therefore, the correct answer to this problem is:

"The elapsed time is _____________ ." (Include both the number and the units of measurement)