4) A helicopter travels From A to B on the route shown at the right. IN The .S legs ure 30 km for g ane the _ Wlem is 20 km long- It takes he helicopter 3 hr .o make the trip what is the he._0_ter's A D average velocity for the try (a) 6w.b km hr w () 10v kun hr E (-) 6.. j km/hr E (d) 33 3 km/hr E (e) cannot determine with the given information