how fast is it.........

if a small plane with glide ratio 7:1
glide ratio 7:1 means plane moves forward 7 feet
for every 1 foot altitude (height) lost.

so if a plane at 10000 feet in air has its engine shut off.
how fast will it be moving forward when the plane touches the ground.

>> 'dumbass I said with engine shut off'
Well, you really are a fucking moron aren't you?  Do you think we can't read the OP ourselves?  You said 'so if a plane at 100000 feet in air has its engine shut off' which implies you've just shut off the engine.  Otherwise, what would be the point of mentioning the engine - it would have been better to use a glider as an example you toerag.