Search Questions

A,B,C,D together can finish a job in 12 days, D is twice as efficient as A. A alone starts the job and discontinues after 5 days. For two subsequent days B and C work alternately after which they discontinue. At this point of time 1/10th of the work gets over. If D alone is to finish the remaning work, how many days would he take?

I started climbing up the hill at 6 a.m. and reached the top of the temple at 6 p.m. Next day I started coming down at 6 a.m. and reached the foothill at 6 p.m. I walked on the same road. The road is so short that only one person can walk on it. Although I varied my pace on my way, I never stopped on my way. Then which of the following must be true?
A) My average speed downhill was greater than my speed uphill
B) There must be a point where I reached at the same time on both the days.
C) There must be a point where I reached at the same time on both the days.
D) There cannot be a spot where I reached at the same time on both the days.

Can somebody explain the solution.?

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