That is about 160 mph.
About 170 mph.
For a fairly new helicopter, around 120 knots. Around 150 mph, except for fast military helicopters.
a helicopter that lifts heavy objects
148knots
150 knots
575 mph.
80
That cannot be calculated without knowing the average speed over that distance.
What would you call "average". I don't see there is an "average" helicopter, all are different.
The speed of a commercial jetliner is around 560 miles per hour.
09527349074537mph
Lynx ZB-500 249.09 mph world record. Fastest helicopter.