exam Maths Puzzle Numerical Ability

I am having trouble dividing fractions. Can someone please help me.

3 1/5+ 2 1/4

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exam Other Question

First determine the deflection based solely on the distributed load.
delta = 5wL^4/384 EI
= (5)(2kip/ft)(24^4ft)(12in/ft)^3/(384)(29,000ksi)(1330in^4)
= .387
A sprinter who averaged 30ft/sec completed a race one second before another sprinter who averaged 28 ft/sec. what was the distance of the race?