Two Pelton wheels A and B have the same specific speed and are working under the same head. Wheel A.

Two Pelton wheels A and B have the same specific speed and
are working under the same head. Wheel A produces 400 kW at 1000 rpm. If wheel
B produces 100 kW then its rpm is

(a) 4000

(b) 2000

 (c) 1500

(d) 1250