A train trip took 4 hours. For 1/2 the trip, the train traveled at 60 kilometers per hour. For the rest of the trip, the train traveled at 100 kilometers per hour. How far did the train travel
in all?
0 240 kilometers
0 320 kilometers
O 400 kilometers
O 600 kilometers

each side has a different length.  

step-by-step explanation:

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step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -