DRDO Multi tasking staff Model paper 5

The person covers 3/4 of the distance in 2/3‌rd time.
Total distance to be covered = 12 km.
In ⅔‌rd time he has covered ¾ × 12 km. = 9 km.
∴ Remaining distance = (12 – 9) km. = 3 km.
Total allotted time 45 min.
9 km. he has covered in ⅔ × 45 minutes = 30 minutes.
∴ Remaining time = (45 – 30) minutes = 15
∴ He has to cover 3km. in 15 minutes.
In other words 12km. in 1 hour.
∴ Required speed is 12 km/hour.