John uses 5 liters of fuel per km to travel. How many liters of fuel should John plan to use if he plans to travel on two trips of 30 km and 20 km?
The first trip will use 30*5=<<30*5=150>>150 liters of fuel.
The second trip will use 20*5=<<20*5=100>>100 liters of fuel.
The total liters of fuel are 150+100=<<150+100=250>>250 liters.
#### 250