exam Maths Puzzle Numerical Ability

can yo help me solve this: An airplane was at a crusing altitude, then descended 3,500ft. If the airplane is at 28,500 now, what was the crusing altitude?

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exam Other Question

Please simplify and use only positive exonents.
(4b^2u/3u^2)(2u^3/b^2)^2 PLEASE HELP- A TRAIN LEAVES THE STATION AT 6PM GOING WEST AT 80 MI/. ON A PARRALLEL TRACK ANOTHER TRAIN LEAVES 3HRS LATER GOING 100 MI/H. AT WHAT TIME WILL THE 2ND TRAIN CATCH UP WITH THE FIRST TRAIN?