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 \(\displaystyle x\).

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

\(\displaystyle x=7200 sec\)