What is Dimensional Formula of Speed?

Speed is defined as change of distance per unit time. Speed is a scalar quantity.

Mathematically,
Speed  = distance / time .

Dimensional Formula of Distance  = M⁰L¹T⁰
Dimensional Formula of Time = M⁰L⁰T¹

Putting these values in above equation we get,
Dimensional Formula of Speed = M⁰L¹T^-1
SI unit of Speed is ms^-1