Question 644580
(a)
{{{ 406 / 70 = 5.8 }}} m/sec
(b)
In words:
( m/sec )x( km/m )x( sec/min )x( min/hr ) = km/hr
{{{ 5.8*( 1/1000 )*( 60/1 )*( 60/1 ) }}}
{{{ ( 5.8/1000 )*3600 }}} 
{{{ 5.8*3.6 = 20.88 }}} km/hr