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Initial speed = 80km/hr
Total distance = 80 x 10 = 800km
New speed = 800/4 =200km/hr
Increase in speed = 200 - 80 = 120km/hr

Drop Ship refers to, a manufacturer shipping goods directly to one of its customers' customer (instead of delivering the goods to the customer that placed the order with the manufacturer).

This concept of shipping goods is called as drop ship, drop shipping or a drop shipment.

We already know that the calendar after a leap year repeats again after 28 years.

Here 1988 is a Leap year, then the same calendar will be in the year = 1988 + 28 = 2016.

In accounting, the Three-way Match refers to a procedure used when processing an invoice received from a vendor or supplier. The three-way match is an important step in safeguarding an organization's assets. The purpose of the three-way match is to avoid paying incorrect and perhaps fraudulent invoices.

Here Three-way refers to the three documents involved :

* Vendor's invoice which was received and will become part of an organization's accounts        payable if approved.

* Purchase order that was prepared by the organization.

* Receiving report that was prepared by the organization.

And Match refers to the comparison of the quantities, price per unit, terms, etc. appearing on the vendor's invoice to the information on the purchase order and to the quantities actually received.

After the vendor's invoice has been validated by the three-way match, it can be further processed for payment.

We need to find the total cost to send r messsages, r > 1000.

The first 1000 messsages will cost Rs.p each (Or) 

The total cost of first 1000 messsages = Rs.1000p

The remaining (r - 1000) messsages will cost Rs.q each (Or)

The cost of the (r - 1000) = Rs.(r - 1000)y

Therefore, total cost = 1000p + rq - 1000q

= 1000(p - q) + qr

The following arrangements satisfy all 3 conditions.

Arrangement 1: 3 books in a row; 12 rows.

Arrangement 2: 4 books in a row; 9 rows.
Arrangement 3: 6 books in a row; 6 rows.
Arrangement 4: 9 books in a row; 4 rows.
Arrangement 5: 12 books in a row; 3 rows.

Therefore, the possible arrangements are 5.