From a point on a circular track 5 km long A, B and C started running in the same direction at the same time with speeds of 2 1/2 km per hour, 3 km per hour and 2 km per hour respectively. Then on the starting point all three will meet again after

1.  30 hours

2.  6 hours

3.  10 hours

4.  15 hours

4

10 hours

Explanation :
No Explanation available for this question

If xy (x + y) = 1, then the value of 1/x3y3 –x3 –y3 is :

1.  0

2.  1

3.  3

4.  -2

4

3

Explanation :
No Explanation available for this question

In the adjoining figure A, B, C, D are the concyclic points. The value of ‘x’ is:

1.  500

2.  600

3.  700

4.  900

4

500

Explanation :
No Explanation available for this question

Each internal angle of regular polygon is two times its external angle. Then the number of sides of the polygon is :

1.  8

2.  6

3.  5

4.  7

4

6

Explanation :
No Explanation available for this question

In a division problem, the divisor is 4 times the quotient and 3 times the remainder. If remainder is 4, the dividend is

1.  36

2.  40

3.  12

4.  30

4

40

Explanation :
No Explanation available for this question

There is a small island in the middle of a 100 m wide river. There is a tall tree on the island. Points P and Q are points directly opposite to each other on the two banks and in line with the tree. If the angles of elevation of the top of the tree at P and Q are 300 and 450, then the height of tree is :

1.  50(√3-1)m

2.  50√3 m

3.  50(√3+1)m

4.  100/√3-1m

4

50(√3-1)m

Explanation :
No Explanation available for this question

Each member of a picnic party contributed twice as many rupees as the total number of members and the total collection was Rs. 3042. The number of members present in the party was

1.  2

2.  32

3.  40

4.  39

4

39

Explanation :
No Explanation available for this question

The average of 15 numbers is 7. If the average of the first 8 numbers be 6.5 and the average of last 8 numbers be 9.5, then the middle number is

1.  20

2.  21

3.  23

4.  18

4

23

Explanation :
No Explanation available for this question

A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely

1.  4 hours

2.  4 hours 15 minutes

3.  3 hours 15 minutes

4.  3 hours 45 minutes

4

3 hours 45 minutes

Explanation :
No Explanation available for this question

1.  15 days

2.  20 days

3.  25 days

4.  30 days

4