Question 1157861
Let {{{ s }}} = her actual speed in mi/hr
Let {{{ t }}} = her actual time
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(1) {{{ 495 = s*t }}}
(2) {{{ 517 = ( s + 2 )*t }}}
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(1) {{{ t = 495/s }}}
Plug this into (2)
(2) {{{ 517 = ( s + 2 )*( 495 / s ) }}}
(2) {{{ 517s = 495s + 990 }}}
(2) {{{ 22s = 990 }}}
(2) {{{ s = 45 }}}
Here average speed was 45 mi/hr