Problema Solution
following a severe snowstorm, Ken and Bettina Reeves must clear their driveway and sidewalk. Ken can clear the snow by himself in 2 hours. Bettina can clear the snow by herself in 7 hours. After Bettina has been working for 1 hour, Ken is able to join her. How much longer will it take them working together to remove the rest of the snow?
Answer provided by our tutors
let 'x' represent the time they need to remove the rest of the snow, x>0
1*(1/7) + x(1/2 + 1/7) = 1
by solving we find:
x = 12/9 hr
x = 1 hr (1/3)*60 min
x = 1 hr 20 min
click here to see the step by step solution of the equation:
Ken and Bettina need 1 hours and 20 min more to remove the rest of the snow.