A person starts walking at a speed of 5km/hr through half the distance, rest of the distance he
covers with aspeed 4km/hr. Total time of travel is 18 hours. What is the maximum distance he
can cover?	Select the correct option
A) 20km B) 40km C) 60km D) 80km E) 90km
t=d/s, so   18=x/2*1/5+x/2*1/4(because half distance with 5 km/ph, and remaining half with 4km/hr)   18=x(18/80)   x=80km   ANSWER:80km
<result>D</result>
A person starts walking at a speed of 5km/hr through half the distance, rest of the distance he
covers with aspeed 4km/hr. Total time of travel is 18 hours. What is the maximum distance he
can cover?