TASK DEFINITION: In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
PROBLEM: The metre per second ( American English : meter per second ) is an SI derived unit of both speed ( scalar ) and velocity ( vector quantity which specifies both magnitude and a specific direction ) , defined by distance in metres divided by time in seconds .

SOLUTION: Metre per second is an SI unit of measurement of both speed and velocity .

PROBLEM: Substance abuse , also known as drug abuse , is a patterned use of a drug in which the user consumes the substance in amounts or with methods which are harmful to themselves or others , and is a form of substance-related disorder .

SOLUTION: Substance abuse , or drug abuse , happens when a person uses a drug over and over again , in ways that hurt their health .

PROBLEM: Speed dating is a formalized matchmaking process which has the purpose of encouraging eligible singles to meet large numbers of new potential partners in a very short period of time .

SOLUTION:
Speed dating is a formal dating process for singles .