Question 260893
(i) {{{(1/10)*x + (1/14)*x = 1}}}
step 1 - multiply by 70 to get
(ii) {{{7x + 5x = 70}}}
add like terms to get
 (iii) {{{12x = 70}}}
divide by 12 to get
 (iv) {{{x = 70/12}}}
it will take them about ~ 5.833 hours together.