Originally posted by Sameer Jamal:
A software engineer just returned from US has eaten too much fat and put a lot of weight every sunday he starts walking 4 km/hr on level
ground then up at 3 km\hr then back down hill at 6km\hr then again
on level grounggd at 4km\hr till he reaches his destination if he
returned home at 9 p.m. e what is the distance did he covered ?
I think you're missing some information needed to solve the problem.
If he starts at 9 a.m., then he covers quite a bit more ground in that 12 hours than if he starts at 8 p.m.
HOWEVER, I think the "trick" you're hoping we'll find is that the length of road on the hill is irrelevant. Let's say the hill road is 6km long. It would take him (6km)/(3km/hr)=2 hours to walk up the hill and (6km)/(6km/hr)=1 hour to walk back down. This gives an overall hill walking speed of (12km)/(1hr+2hr) = 4 km/hr. Since this is the same speed he walks on level ground, we can just pretend he walks 4 km/hr the whole way. If he starts at 8 p.m., then he goes 4 km.