The speed depends on the aircraft type and also on the weight of the aircraft. The more load it is carrying, the faster it needs to travel to land safely.
An airliner will be travelling at 120mph or faster as it lands. A 747 will usually be moving faster than a smaller passenger plane - in the region of 150mph or more. Concorde, designed for extreme speed needs to be travelling faster still. the design that helps it travel so fast also means that it needs to land at higher speeds than all other airliners.
Light aircraft will typically be landing at a speed of below 100mph.
Planes fly about 80 to 100 miles per-hour.
by using lots of fuel and by going very fast.
It depends whether the flight is overflying London or if it is taking off or landing at London.
Only jet fighter planes break sound barrier now.
Landing
Humans weigh too much and can't run fast enough to fly. But they have minds to be able to build planes that can allow them to fly.
A Space Shuttle lands at 343 to 364 kmph.
Of course, planes can fly.
Float plane. Bush pilots can fly either standard landing gear or floats.
A runway
it can fly
Depends on the Plane. Planes are aerodynamically designed different. Most jet generation aircraft fly very fast and their design does not permit them to fly slow and stay airborne. But some Slow propeller driven aircraft especially the classic two wing configurations can maintain altitude and much slower speeds but that also means they Can't fly very fast at max speed. But you also get VTOL (vertical take and Landing) Jets that turn your question into a different argument