Q.10. A pilot in a plane wants to go 500 km towards north. To reach straight to his desired position the pilot has to drive his plane 53$°$ west of north in presence of wind, which is blowing in due east. The time taken by pilot to reach his destination is 10 hr. The velocity of wind is
(A) $\frac{200}{3}$ km/hr
(B) $\frac{100}{3}$ km/hr
(C) 200 km/hr
(D) 150 km/hr