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/h greater than the speed of the car?

step-by-step explanation:

c

-by-step explanation:

it would be c

i think it is c hope that

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629