Question 913021
Let {{{ t }}} = the time in minutes until
the sub meets the diver
Let {{{ d }}} = distance in feet the
diver rises in {{{ t }}} minutes
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Equation for diver:
(1) {{{ d = 10t }}}
Equation for sub:
(2) {{{ 250 - d = 30t }}}
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Substitute (1) into (2)
(2) {{{ 250 - 10t = 30t }}}
(2) {{{ 40t = 250 }}}
(2) {{{ t = 6.25 }}}
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The sub meets the diver .75 min ( 45 sec )
before diver runs out of oxygen