Question 749225
The 1st train takes 2 hrs to go from A to B
Let {{{ d }}} = distance from A to B
{{{ d = 90*2 }}}
{{{ d = 180 }}} Km
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The 2nd train takes 1 hr and 20 min which is
{{{ 1.333 }}} hrs to go the same distance
{{{ 180 = r*1.333 }}}
{{{ r  = 135 }}}
The average speed of the 2nd train is 135 km/hr