To solve this problem we can set up a proportion and cross multiply to solve for our unknown. 

$\displaystyle \frac{1km}{100,000 cm}=\frac{4km}{x}$

First we cross multiply. 

$\displaystyle 1km(x)=4km(100,000cm)$ 

Then we divide each side by $\displaystyle 1km$ to isolate the $\displaystyle x$.

$\displaystyle \frac{1km(x)}{1km}=\frac{4km(100,000cm)}{1km}$

$\displaystyle x=400,000 cm$

To solve this problem we can set up a proportion and cross multiply to solve for our unknown. 

$\displaystyle \frac{1m}{100 cm}=\frac{4m}{x}$

First we cross multiply. 

$\displaystyle 1m(x)=4m(100cm)$ 

Then we divide each side by $\displaystyle 1m$ to isolate the $\displaystyle x$.

$\displaystyle \frac{1m(x)}{1m}=\frac{4m(100cm)}{1m}$

$\displaystyle x=400 cm$

To solve this problem we can set up a proportion and cross multiply to solve for our unknown. 

$\displaystyle \frac{1m}{100 cm}=\frac{2m}{x}$

First we cross multiply. 

$\displaystyle 1m(x)=2m(100cm)$ 

Then we divide each side by $\displaystyle 1m$ to isolate the $\displaystyle x$.

$\displaystyle \frac{1m(x)}{1m}=\frac{2m(100cm)}{1m}$

$\displaystyle x=200 cm$

To solve this problem we can set up a proportion and cross multiply to solve for our unknown. 

$\displaystyle \frac{1m}{100 cm}=\frac{5m}{x}$

First we cross multiply. 

$\displaystyle 1m(x)=5m(100cm)$ 

Then we divide each side by $\displaystyle 1m$ to isolate the $\displaystyle x$.

$\displaystyle \frac{1m(x)}{1m}=\frac{5m(100cm)}{1m}$

$\displaystyle x=500 cm$

To solve this problem we can set up a proportion and cross multiply to solve for our unknown. 

$\displaystyle \frac{1hr}{60 min}=\frac{5hr}{x}$

First we cross multiply. 

$\displaystyle 1hr(x)=5hr(60min)$ 

Then we divide each side by $\displaystyle 1hr$ to isolate the $\displaystyle x$.

$\displaystyle \frac{1hr(x)}{1hr}=\frac{5hr(60m)}{1hr}$

$\displaystyle x=300 min$

To solve this problem we can set up a proportion and cross multiply to solve for our unknown. 

$\displaystyle \frac{1hr}{60 min}=\frac{4hr}{x}$

First we cross multiply. 

$\displaystyle 1hr(x)=4hr(60min)$ 

Then we divide each side by $\displaystyle 1hr$ to isolate the $\displaystyle x$.

$\displaystyle \frac{1hr(x)}{1hr}=\frac{4hr(60m)}{1hr}$

$\displaystyle x=240 min$

To solve this problem we can set up a proportion and cross multiply to solve for our unknown. 

$\displaystyle \frac{1hr}{60 min}=\frac{3hr}{x}$

First we cross multiply. 

$\displaystyle 1hr(x)=3hr(60min)$ 

Then we divide each side by $\displaystyle 1hr$ to isolate the $\displaystyle x$.

$\displaystyle \frac{1hr(x)}{1hr}=\frac{3hr(60m)}{1hr}$

$\displaystyle x=180 min$

To solve this problem we can set up a proportion and cross multiply to solve for our unknown. 

$\displaystyle \frac{1hr}{3600 sec}=\frac{5hr}{x}$

First we cross multiply. 

$\displaystyle 1hr(x)=5hr(3600sec)$ 

Then we divide each side by $\displaystyle 1hr$ to isolate the $\displaystyle x$.

$\displaystyle \frac{1hr(x)}{1hr}=\frac{5hr(3600sec)}{1hr}$

$\displaystyle x=18,000 sec$

To solve this problem we can set up a proportion and cross multiply to solve for our unknown. 

$\displaystyle \frac{1hr}{3600 sec}=\frac{3hr}{x}$

First we cross multiply. 

$\displaystyle 1hr(x)=3hr(3600sec)$ 

Then we divide each side by $\displaystyle 1hr$ to isolate the $\displaystyle x$.

$\displaystyle \frac{1hr(x)}{1hr}=\frac{3hr(3600sec)}{1hr}$

$\displaystyle x=10,800 sec$

To solve this problem we can set up a proportion and cross multiply to solve for our unknown. 

$\displaystyle \frac{1hr}{3600 sec}=\frac{2hr}{x}$

First we cross multiply. 

$\displaystyle 1hr(x)=2hr(3660sec)$ 

Then we divide each side by $\displaystyle 1hr$ to isolate the $\displaystyle x$.

$\displaystyle \frac{1hr(x)}{1hr}=\frac{2hr(3600sec)}{1hr}$

$\displaystyle x=7200 sec$