# By increasing her usual speed by 20 kilometers per hour, a bus driver decreases the time on a 20-kilometer trip by 5 minutes. How do you find the usual speed?

##### 1 Answer

Apr 21, 2018

#### Answer:

**Usual speed of the bus was** **km/hour.**

#### Explanation:

Let the usual speed be

is

By given condition

sides we get,

Either

can not be negative

Usual speed of the bus was