The car drove some distance in 3 hours and 20 minutes. If it increases speed by 10 km/h, it goes this distance in 2.5 hours. Calculate the distance.

Correct answer:

s =  100 km

Step-by-step explanation:

s = v • (3+20/60)
s = (v+10) • 2.5

60s-200v = 0
s-2.5v = 25

s = 100
v = 30

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