a cube has a rib ABCD.EFGH, the midle point P on BF so that BP = PF,
and the midle point Q on FG so that FQ = QG
how long projection point C to APQH field ?
A man travels 29 km on an open road at a certain speed. In the city, he
reduce his speed by 420 km/hr, and he find that he take him the same time
to cover 15 km, Find his average speed.
(a) On the open road
(b) In the city