The sum of the age of a father and his son is 36 years. if
they both live on till the son becomes as old as the father
is now, the sum of their ages will be 84 years. find their
present ages.

Aplane is flying at 32,500 feet. it needs to rise to 36,000 feet in two stages.• in stage 1, it rises 5% of its initial altitude of 32,500 feet.• in stage 2, it rises at a rate of 125 feet per minute.how many minutes does it take for the plane to rise during stage 2?