John was driving his car to the city A to visit his family. He was in constant velocity and see 3 transit signs informing the distance left to arrive in city A.

He saw one sign informing:

"City A \(\boxed{ a0b ㎞}\) left"

After 45 minutes he saw other sign:

"City A \(\boxed{ ba ㎞}\) left"

After 45 minutes he saw more other sign:

"City A \(\boxed{ ab ㎞}\) left"

What was the speed that John was driving?

**Note:**
**a0b**, **ba** and **ab** are 3 and 2 digit numbers. The **a0b** have the 0 on middle.

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