Question
Train A, moving at 90 km/h, crosses a pole in 8 seconds.
Find the time it takes to cross another train of equal length, coming from the opposite direction at 90 km/h.Solution
Speed of Train A = 90 Γ 5/18 = 25 m/s
Length of Train A = 25 Γ 8 = 200 m
Length of Train B = 200 m
Speed of Train B = 90 Γ 5/18 = 25 m/s
Total length = 200 + 200 = 400 m
Relative speed = 25 + 25 = 50 m/s
Time = 400 / 50 = 8 seconds
A and B together can do a work in 5 days. If A can alone do the same work in 15 days, then in how many days B alone will do the same work?
A and B can complete a job together in 30 days; B and C can complete the same job together in 25 days, while C and A can complete the same job together ...
Sufficient food-supply was arranged to last for 30 days for 250 soldiers. If 50 soldiers did not attend the camp, for how many extra days will the food-...
βAβ is 80% more efficient than βBβ. βAβ and βBβ work together for 5 days after which βAβ is replaced by βCβ. βBβ and βCοΏ½...
Shivam and Harish can do a job alone in 90 days and 120 days respectively. Both work together and earn Rs. 5,250. Find Shivamβs earnings.
Suppose Y individuals can complete a task in (Y - 28) days, and (Y + 12) individuals can finish the same task in (Y - 32) days, what is the number of da...
- 40 women working 10 hours a day take 12 days to complete a project. How many women working for 7 hours a day are needed to complete twice the given project...
βAβ and βBβ can do a piece of work in 15 days and 20 days, respectively. They started working together but βAβ left after 3 days. Find the t...
3 men, 4 women and 5 boys can do a piece of work in 15 days, 20 days and 25 days respectively. For first 3 days 3 men and 2 women work together and for ...
Ravi and Rekha, alone can complete a work in 25 days and 50 days, respectively. They started the work together and left after 10 days such that the rem...
