painting walls

Algebra Level 2

If it takes Bob 4 hours to paint a wall and John 6 hours to paint the same wall, how long does it take them to paint the wall together?

4 hrs 24 min 5 hrs 2 hrs 24 min 3 hrs 24 min

Fred Looka by Fred Looka , 21, Japan

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1 solution

t 4 + t 6 = 1 \dfrac{t}{4}+\dfrac{t}{6}=1

t = 2.4 h o u r s t=2.4~hours or

t = 2 h o u r s a n d 24 m i n u t e s \boxed{t=2~hours~and~24~minutes}

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