- Thread starter
- #1

#### karush

##### Well-known member

- Jan 31, 2012

- 3,004

$\textsf{Each has a speed of 155 km/h with respect to the ground.}\\ $

$\textsf{If they are initially 8.5 km apart}\\$

$\textsf{a. how long will it be before they reach each other?}\\$

\begin{align*}\displaystyle

t&=\frac{d}{r}\\

&=\frac{1}{2}\cdot\frac{8.5}{155}\\

&\approx0.0274 \, h \\

&\approx\color{red}{99 \, seconds}

\end{align*}

ok this looks very simple

so I'm sure I got it wrong