The sum of the speeds of two trains is 719.3 miles per hour. If the speed of the first train is 8.7 mph faster than that of the second train find the speeds of each. What is the speed of the first train?

First train 364, second train 355.3

Step-by-step explanation:

Let's me just say

First train = x

Second train = y

Easier to type like that

So

x + y = 719.3

they say " first train is 8.7 mph faster than that of the second train "

Therefore

x = y + 8.7

Now u have these two equations

x + y = 719.3

x = y + 8.7

Now since u know what is x, just put it in your first equation

x + y = 719.3

y + 8.7 + y= 719.3

2y = 710.6

= 355.3

Therefore the speed of the first train is

x + y = 719.3

x + 355.3 = 719.3

x =364

56

step-by-step explanation:

2 & 7

step-by-step explanation:

he climbs 300 ft/hr at a constant rate. the peak is at 1,500 ft.

when going up, he reaches 600 ft in 2 hours. remember, that he is going in a constant rate. divide 600 with 300:

600/300 = 2

assuming that he takes the same route back (meaning that it's a 1500 ft route back, you can solve.

note also that you are solving when he gets back to 600 ft after he reaches the peak.

first, find the amount of hours it takes to get up the peak. divide the total amount (1500), with the ft/her (300) to get the amount of hours (x):

1500/300 = x

x = 5

it takes jamie 5 hours to get up. now, he is returning down, and reaches 600 (his current destination). remember that he climbs at a constant 300 ft/hr. divide 600 with 300:

600/300 = x

x = 2

now add the two numbers together.

x = 5 + 2 = 7

jamie takes 7 hours to go up the mountain and reach his current position when descending.

(total amount/constant rate) = (time).

remember that it is a constant rate, so in total, when he gets back down the mountain, it will take the same amount of time as when he goes up. the total amount for the round trip is: 5 + 5 = 10.

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