Answer:
Orginal Speed is 135
Step-by-step explanation:
The ratio of final speed: original speed is

We know that 90 km is it final speed so, we set up a proportion


Answer:
I think you need to put more info
Step-by-step explanation:
Answer:
5000
Step-by-step explanation:
Either I do it I get 5000.
Sorry if this is wrong.
Answer:
A≈78.54
Step-by-step explanation:
A=πr2
I think this is right
I dont completely know but it might be 3