Correct Answer - Option 2 : B and C
Given:
Speed of X in the whole journey = 60 km/h
Calculation:
Let 4x be the total time of the journey
⇒ Total distance = 60 × 4x = 240x
In first case
Distance covered = (2/5) × 240x = 96x
Time taken = (1/4) × 4x = x
Speed in first case = 96x/x = 96 km/h
In second case
Distance covered = 240x – 96x = 144x
Time taken = 4x – x = 3x
Speed in second case = 144x/3x = 48 km/h
B. (2/8) of (3/4) of 256
⇒ (3/16) × 256
⇒ 48
B is correct
C. 48
C is correct
∴ B and C are correct.