Question 499812
Let {{{t}}} = the equal periods of time during which
he drove at 3 different speeds
given:
{{{ 300 = 80t + 90t + 100t }}}
{{{ 300 = 270t }}}
{{{ t = 1 + 30/270 }}}
{{{ t = 1 + 1/9 }}}
He drove 90 km/hr for 1 1/9 hr