Question 1143161
Let {{{ s }}} = the speed of the truck in km/hr
Let {{{ d }}} = distance in km the motorcycle travels in 15 min
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Equation for motorcycle:
(1) {{{ d = 80*( 15/60 ) }}}
Equation for truck:
(2) {{{ d - s*(45/60 ) = s*( 15/60 ) }}}
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(1) {{{ d = 80*( 1/4 ) }}}
(1) {{{ d = 20 }}} km
and
(2) {{{ d - s*( 3/4 ) = s*( 1/4 ) }}}
(2) {{{ d = s }}}
(2) {{{ s = 20 }}} km/hr
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check answer:
In 45 min plus 15 min, the truck travels distance {{{ d }}}
{{{ d = 20*1 }}}
{{{ 20 = 20 }}}
OK