Answer:
60 meters
Step-by-step explanation:
(x+1)² = x² + (x-49)²
x²+2x+1 = x² + x²-98x+2401
x² - 100x + 2400 = 0
x² - 60x - 40x + 2400 = 0
x(x - 60) - 40(x - 60) = 0
(x - 40)(x - 60) = 0
x = 40, 60
If x = 40, x - 49 = -9 which is not possible
So x = 60m