Tad and Ken both cycle to School from homes at the same speed. Tad lives 20km away from School and Ken lives 15km away from work. Tad takes 1 hour more than ken. how long Ken takes to get to school?

Answer 1

t = 20 km

k=15 km

T=K+1 measured in hours, T= Tad's time, K=Ken's time

distance = rate of speed times time

d=rh

r = d/h

rate of speed is the same for both Tad and Ken

r=d/h = 20/T = 15/K

20/(K+1) = 15/K

cross multiply

20K = 15K +15

5K =15

K =3 hours

T = 4 hours

It takes Ken 3 hours to get to school

going 15 km at 5 km per hour

5(.62) = about 3.1 miles per hour

average normal walking speed is 5 mph

Ken is riding his bike so slowly, he'd be better off walking