Aboat traveled 280 miles downstream and back. the trip downstream took 7 hours. trip back took 14 hours. what is the speed of the boat in still water? what is the speed of the current?

speed of the boat: 30 mi/h, speed of the current: 10 mi/h

Explanation:

- During the trip downstream, the boat traveled 280 miles with a speed of (v+c), where v is the speed of the boat and c is the speed of the current. Since the time taken is 7 h, we can write the following equation:

which is the equivalent of

- During the trip upstream, the boat traveled 280 miles with a speed of (v-c), where v is the speed of the boat and c is the speed of the current. Since the time taken is 14 h, we can write the following equation:

So we have two equations that we can solve simultaneously to find v and c:

Solving:

Multiplying first equation by 2:

By adding 2nd equation to 1st one, we get

From 1st equation we get

Substituting into second one we get

So, we have:

- speed of the boat in stil water: 30 mi/h

- speed of the current: 10 mi/h

the temperature and the pressure affect solubility. temperature affects by changing the properties of the solvent. the increase in pressure increases solubility, the decrease in pressure decreases solubility.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.