Ques:- What is the minimum number of four digits formed by using the digit 2, 3, 0, 7?
A. 2047
B. 2247
C. 2407
D. 2470
Ques:- Two trains are coming from opposite directions with speeds of 75 km/hr and 100 km/hr on two parallel tracks. At some moment the distance between them is 100 km. After T hours, distance between them is again 100 km. T is equal to
A. 1 hr
B. $$1{1} / {7}$$
C. $$1{1} / {2}$$
D. 2 hrs