Cars C1 and C2 travel to a place at a speed of 30 and 45 km/h respectively. If car C2 takes 21⁄2 hours less time than C1 for the journey, the distance of the place is Choices:
A) 300 km
B) 400 km
C) 350 km
D) 225 km
E) None of these
Let C1 takes t hrs. Then,   ∴ Distance is same.   ∴ 30t = 45(t - 5⁄2)   ⇒ t = 15⁄2 hrs.   ∴ 225 kmistance = 30 × 15⁄2 = 225 km   Answer 225 km
<result>D</result>
Cars C1 and C2 travel to a place at a speed of 30 and 45 km/h respectively. If car C2 takes 21⁄2 hours less time than C1 for the journey, the distance of the place is