mph

and then

Driving 30 minutes @ 45mph and 30 minutes @15mph

this means???

Let, number of mangoes is .

1st,

King takes

Remains

2nd,

Queen takes

Remains

3rd,

The 3 chief princes take , and of the successive remainders

Remain,

Last,

The youngest child took the reamaining 3 mangoes

Therefore,

Let, your money is .

1st,

You remain

2nd,

You used

therefore, you remain

Last,

You used

Therefore, you remain