Answer:

65 m

Step-by-step explanation:

Given:

t1= 30 mins(1hr/60mins) = 0.5 hrs ;

s= 50 mph

t2= 1hr

s2= 40 mph

dt= d1+d2

S=d/t => d=st

d1= s1t1= 0.5hr(50mph)= 25m

d2= s2t2= 1hr(40mph)= 40 m

dt= d1+d2 = 25+40 = 65m