Question

Can someone help me the 2nd problem I don’t understand it

Answer 1

So this means the bus B covered 390-120=270 miles when bus A has already reached 390 miles.

270 miles

Explanation:

So is A is going faster than B so A will reach the destination first.

When will A reach it's destination?

Let's find out.

To solve this problem, the following will come in handy:

Speed=distance/time or time*Speed=distance or time=distance/speed .

time=distance/speed

`T_A=(390)/(S_A)`

`T_A=(390)/(65)`

`T_A=6`

So it will take bus A 6 hours to cover the distance of 390 miles.

How much time would have it taken bus B to reach that same distance?

`T_B=(390)/(45)`

`T_B=8.\overline{6}`

So it would have taken bus B
`8.\overline{6}` hours to cover a distance of 390 miles.

So the time difference is
`8.\overline{6}-6=2.\overline{6}` hours.

It will take
`2.\overline{6}` more hours than bus A for bus B to complete a distance of 390 miles.

So bus B traveled
`2.\overline{6} \cdot 45=120` miles (used the time*speed=distance) after bus A got to it's destination.

So this means the bus B covered 390-120=270 miles when bus A has already reached 390 miles.