exam Maths Puzzle Numerical Ability

Kim can unload a delivery truck in 20 minutes and Rom can do it in 35 mins. If they work together, how long will it take?

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exam Other Question

I need help on trig identities please.....

Use the fundamental identities to write the expression in terms of a single trig function

(cscx/secx-tanx) - (cscx/secx+tanx)

Th Can someone please help me simplify this expression?
Use trigonometric identities to simplify the expression
(csc theta)(1-cos ^2 theta)(cot theta)