Explanation

Given:

• Distance = 300 km
• Speed of first train = 60 km/h
• Speed of second train = 90 km/h

Since they are moving toward each other, their relative speed is:

$$60+90=150\text{km/h}$$

Time:

300​/150=2 hours

Last updated 25-07-2026 by NA

Explanation

The pattern alternates between +2 and ×2:

• 4 → 6 (+2)
• 6 → 12 (×2)
• 12 → 14 (+2)
• 14 → 28 (×2)
• 28 → 30 (+2)
• 30 → 60 (×2)

Last updated 17 july 2026 by NA

Explanation

Analytical Seating Arrangement; A, B, C, D, E, F, G, and H are sitting around a circle facing the centre. A sits fourth to the right of H. A sits second to the left of F. C is not a neighbour of F or B. D sits third to the right of C. H does not sit next to G.

1. Who sits between B and D? F

2. Which pair sits between H and G? C and E

3. Which pair does not belong to the group: AE, HF, BD, GE? BD

4. Who is immediately right of A? D

5. Who sits second to the right of B? 4

6. What is the position of B with respect to C? Second to the right

Verified & Updated

Explanation

15 men × 20 days = 300 man-days (total work)

Now, with 25 men:

300 man-days ÷ 25 men = 12 days

Verified & Updated

Explanation

Given: P = False, Q = True, R = False

Expression: (~P ∧ Q) ∨ R

1. ~P = ~False = True

2. ~P ∧ Q = True ∧ True = True

3. (~P ∧ Q) ∨ R = True ∨ False = True

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Quick Rule

NOT changes the value.

AND is True only when both are True.

OR is True when at least one is True.

Explanation

Pattern: Multiply by 2 and add 1

1  

3 = 1 x 2 + 1  

7 = 3 x 2 + 1  

15 = 7 x 2 + 1  

31 = 15 x 2 + 1  

63 = 31 x 2 + 1  

? = 63 x 2 + 1 = 127  

Last verified on 11-07-2026

Explanation

The pattern is:

• $5 times 2 + 1 = 11$
• $11\times 2+1=23$
• $23\times 2+1=47$
• $47\times 2+1=95$

Answer: 95

Last question by NA on 09 July 2026

Explanation

To find the average, we need to first convert each fraction to a decimal:

 5/6 = 0.83

 4/3 = 1.33

 3/4 = 0.75

Then, add the decimals and divide by the number of values:

 0.83 + 1.33 + 0.75 = 2.91

 2.91 ÷ 3 = 0.97

Now, convert the average back to a fraction:

 0.97 ≈ 35/36

Last verified on 01-07-2026

Explanation

The average of the first n natural numbers is given by (n + 1) / 2.

For n = 97:

Average = (97 + 1) / 2

= 98 / 2

= 49

Last verified on 17-06-2026

Explanation

5 × 2 = 10

10 × 2 = 20

20 × 2 = 40

40 × 2 = 80

Last verified on 11-2026