Question

A person traveled a distance of 50 km in 8 hours. he covered a part of the distance on foot at the rate of 4 km per hour and a part on a bicycle at the rate of 10 km per hour. how much distance did he travel on foot?[

Answer 1

let ,he covered X km by foot
so time taken=X/4 hr
again (50-X) km covered by bicycle
here time taken=(50-X)/10 hr

so,
X/4 + (50-X)/10 = 8
=>10X+200-4X=320
=>6X=120
=>X=20