Calculating Speed of Ultrasound in Soft Tissue

[Eddzzz]

i have a problem:

ultrasound takes 70μs to go 100mm in soft tissue/ show that its speed is about 1400ms -1

well i don't really know what fomulas to use but i would say putting 70μs x 10 power -6 so that is 0.000007 then I am stuck...

thanks in advance ;D

 

[catkin]

A ball takes 5 seconds to go 10 meters. Show that it's speed is 2 meters per second.

When you've done that, have another attempt at the original question.