exam Maths Puzzle

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

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exam Other Question

A bus overtakes two boys who are walking in the direction of the bus at 2 km/hr and 4 km/hr in 9 sec and 10sec respectively. The length of the bus and its speed are:

A.

50m and
55
9
m/s

B.

80m and
88
9
m/s

C.

70m and
77
9
m/s

D.

60m and
66
9
m/s 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