self Maths Puzzle

In a kilometre race, if A gives B a 40 mtr start, A wins by 19 sec. But if A gives B a 30 sec start, B wins by 40 mtr. Find the time taken by B to run 5,000 mtr?

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self Other Question

An engineer undertakes a project to build a road of 15km in 300 days and employs 45 men for the purpose .After 100 days,he finds only 2.5km of the road has been completed.find the (approx)number of extra men must employs to finish the work in time.
option
a) 43
b) 45
c) 55
d) 68 The current erection cost of a structure is Rs. 13,200. If the labour wages per day increase by 1/5 of the current wages and the working hours decrease by 1/24 of the current period, then the new cost of erection in Rs. is
option
(A) 16,500
(B) 15,180
(C) 11,000
(D) 10,120