Calculate 7451

The car will cover a certain distance in 3 hours and 20 minutes. If he increases his speed by 10 km/h, he will cover this distance in 2.5 hours. Calculate this 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

Row 2 - 1/60 · Row 1 → Row 2
60s-200v = 0
0.83v = 25


v = 25/0.83333333 = 30
s = 0+200v/60 = 0+200 · 30/60 = 100

s = 100
v = 30

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