4.) gene spent ten minutes riding his bicycle to a friend's house. he left his bike there and, with his friend, walked for 15 min to the gym. Gene rides his bicycle 10km/h faster than he walks. if the entire trip covered a distance of 2.75 km, how far is it from his friends house to the gym??

Question

4.) gene spent ten minutes riding his bicycle to a friend's house. he left his bike there and, with his friend, walked for 15 min to the gym. Gene rides  his bicycle 10km/h faster than he walks. if the entire trip covered a distance of 2.75 km, how far is it from his friends house to the gym??

anonymous · Answer

lets put the rate of the walking as say $r$ to the rate of biking is $r+10$
now we can use distance equals rate times time 
$$10(r+10)+15r=2.75$$ solve for $r$