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24-04-2022
Mathematics

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answer this super simple word problem for so many points

answer this super simple word problem for so many points class=

Respuesta :

24-04-2022

Answer:

60kph

Step-by-step explanation:

Distance = Rate X Time

640 = r x 4+ (r+5) x 7

640 = 4r + 7r + 35

640=11r + 35

640 - 35 = 11r

605 = 11r

r = 605 / 11

r= 55 kph

r=55 =5 =60 kph is the speed of the train

To see if the answer is right: 55 x 4 + 60 x 7 = 220 + 420 = 640 km

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