QA

4

4

4

2

3

4

2

2

1

4

4

2

48

= 5280, then what is the value of 1 + 2 + 3 + ... + n?

4851

1

150

4

3

3

13

44

2

3

20920

3

Since 45 motor cycles reach point B and 11 pm,
the last motorcycle must have left at 10 : 45 and
reached by 11 pm. So the whole journey takes 15
minutes to cover by motor cycle.

If cyclist doubles his speed, he will reach point B
in 30 minutes. Since motorcycle takes 15 minutes
to cover the distance, the first motorcycle reaches
at 10 : 16 and in total 15 motor cycles would reach
by when B reached.

7

As per the instruction, let the first digit be a.

The second digit will be 2a

Third digit will be a

Fourth digit will be (2a + 2b + a) = 7a

Fifth digit will be 3a

Sixth digit will be 4a

∴ Largest value of fourth digit can only be 7.

4

80

12

1

4

3

12

2