Break the total time into three periods:
x: when a&b are on the bike
y: when a rides back for c
z: when a&c are on the bike
since distance = time*speed, write the net distances traveled by each person:
a: 50x-50y+50z = 40
b: 50x+10y+10z = 40
c: 10x+10y+50z = 40
Now solve for x, the time when a turned back.
Three friends anil, bala and chetan, from X to town X to town Y which was 4o km. Anil who had a bike started along with bala while chetan started simultaneously on foot. After some time , anil dropped bala on the way and went back to pick up chetan while bala proceeded to Y on foot. Anil picked up chetan and reached Y at the same time as bala. Anil traveled at 50km/hr. The speed at which bala and chetan walked was 10 km /hr . find the time after which anil turned back?
1 answer
1 answer