Solve this:
Q.4 A man standing on a road has to hold his umbrella at 30 with the verticle to keep the rain away. He throws the umbrella and starts running at 10 km/hr then he finds that rain drops are hitting his head vertically, then speed of rain drops with respect to moving man
(1) 20 km/hr.
(2) 10 km/hr.
(3) km/hr
(4) 10 km/hr.