Calculating Mach Number of Aircraft at Sea Level

[soulja101]

Homework Statement

What is the mach number if an aircraft traveling at sea level at 0 degrees with a speed of A)1140km/h b)900.0km/ the answers are 0.995 abd 0.753 in order. I Cant get those.

Homework Equations

mach number=speed of object/speed of sound

The Attempt at a Solution

322meters per second/316meters per second

1.02meters per second and i got a different number than the answer for number 2

 

[courtrigrad]

for the first it should be: $$\frac{316. 6 \frac{m}{s}}{ 340.29 \frac{m}{s}}$$

 

[soulja101]

where did u get 340 from

 

[courtrigrad]

thats the speed of sound at sea level.