A man holds an umbrella at 30º with the vertical to keep himself dry. He, then, runs at a speed of 10ms–1 and finds the rain drops to be hitting vertically. Speed of the rain drops w.r.t. the running man and w.r.t. earth are
(a) 20ms–1, 10ms–1
(b) 10ms–1, 20√3ms–1
(c) 10√3ms–1, 20ms–1
(d) 20ms–1, 10√3ms–1
