The doorsill of a campus building is h = 7 feet above ground level. To allow wheelchair access, the steps in front of the door are to be replaced by a straight ramp with constant slope 1/10, as shown in the figure. How long must the ramp be?

Question

ybarrap · Answer

slope of ramp = h/l, where h = height and l = length
h = 7 ft
h/l = 1/10, requirement
10h = l
l = 10*7
  = 70 ft
now h/l = 7/10 = 1/10, as required.

Ans. Length of ramp must be 70 ft.

anonymous · Answer

It's not 70 ft.