book Maths Puzzle Numerical Ability

F(x)=x/(x+1)then
f(x-1)=

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book Other Question

One train leaves Los Angeles at 15mph heading for New York. Another train leaves from New York at 20mph heading for Los Angeles on the same track. If a bird, flying at 25mph, leave A = $5000 P = $1250 T= 12 years interest is compounded quarterly

Find rate of interest