Tourists covered 640 km for a 4-hour ride by car and a 7-hour ride by train. What is the speed of the train, if it is 5 km greater than the speed of the car?

distance=rate*time

640=r*4+(r+5)*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

check: 55*4+60*7=220+420=640 km

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.