Question

Is the answer 0.055 seconds? (Only problem 13)

Answer 1

Answer:

98.7 seconds

Explanation:

I believe the answer is not 0.055s

Both trains have the same speed and are approaching each other.

They both have to cover 8.5km, and since they are going the same speed they need to cover half the distance each (4.25km)

So, how long will it take a train going 155km/h to travel 4.25km?

The ratio of

$\frac{155km}{1hour} = \frac{4.25km}{x hours}$

There are 60 x 60 seconds in one hour (3600 seconds)

$\frac{155km}{3600 seconds} = \frac{4.25km}{x seconds}$

Solve for x to get 98.7 seconds

We can do this by flipping both sides of the ratio

$\frac{3600 s}{155 km} = \frac{x seconds}{4.25 km}$

Multiply both sides by 4.25km

4.25 ×  $\frac{3600 s}{155 km} ={x seconds}$

Our unknown x = 98.7 seconds