Truck

In 7 hours started from town Krnov truck at speed 40 km/h. Passenger car started against it in 8 hours 30 minutes from the city of Jihlava at speed 70 km/h. Distance between this two cities is 225 km. At what time and at what distance from Krnov this two cars meet? Sketch the situation.

Result

t = 10:00 h Wrong answer
s =  120 km

Solution:


225 = 40x + 70(x-1.5)
s = 40x
t = 7+x

225 = 40•x + 70•(x-1.5)
s = 40•x
t = 7+x

110x = 330
s-40x = 0
t-x = 7

s = 120
t = 10
x = 3

Our linear equations calculator calculates it.



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