exam Maths Puzzle

A ball is projected vertically up-wards reaches, at the end of 't' seconds, an elevation of 's' feet where s=160t−16t2. The highest elevation is

A.

800

B.

640


C.

400

D.

320

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exam Other Question

In a kilometer race, If Abhishek gives Bharti a 40m start, Abhishek wins by 19sec. But if Abhishek gives Bharti a 30 sec start, Bharti wins by 40 m. Find the time taken by Bharti to run 5,000m?

A.

150 sec

B.

450 sec

C.

750 sec

D.

825 sec
A man jogging inside a railway tunnel at a constant speed hears a train approaching the tunnel from behind at a speed of 30km/h, when he is one third of the way inside the tunnel. Whether he keeps running forward or turns back, he will reach the end of the tunnel at the same time the train reaches that end. The speed at which the man is running is:

A.

6 km/hr

B.

8 km/hr

C.

12 km/hr

D.

10 km/hr