exam Maths Puzzle Numerical Ability

Reduce the following expression to lowest terms:
w^2-4w-21/2w^2-98

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exam Other Question

jerry spent 2.5 h biking up mount lowe, rested at the top for 30 min, and biked down in 1.5 hr. how far did he bike if his rate of ascent was 3 km/h less than his rate of descent? 1/r=1/s+1/t....solve for s

w=a^2/t.....solve for t

thanks