Solution:

7 AM

Explanation:
Train A covers 20x3 km i.e. 60 kms in 3hrs and
Train B covers 25x2 km i.e. 50 kms in 2hrs => total of 110kms

Solution:

Decreases by 4%

Explanation:
New Length : 1.2
New Height : 0.8

Area = 1.2 * .8 = 0.96 (Decreases by 4%)

Solution:

THURSDAY

Explanation:
The first two alphabets are interchanged.
For the next three alphabets, the succeeding alphabet is written.
And then the last three alphabets are reversed.

Solution:

30

Explanation :
It can be divided into 2 series
A) 2 6 12 20 ?
B) 7 14 28 56

Series A is related to our answer =>
2
6 (+4)
12(+6)
20(+8)
30(+10)

Solution:

21

Explanation:
There are 10 ahead of him and there are 10 behind him + tony stark himslef

Solution:

1500

Explanation:
As we know, n(A n B)=n(A)+n(B)-n(A U B)
=> n(A) = 0.75x7500 = 5625.
and n(B) = 0.45x7500 = 3375
n(A U B)= 7500

=> Ans is 5625+3375-7500 = 1500(Answer)

Solution:

Both A and B

Solution:

1000 (x-y) + yz

Solution:

20

Solution:

G*X/G+B (G=Girls, B= Boys)