Correct Answer - Option 1 : 70 kmph
GIVEN:
A person travels from A to B at a speed of 60 km/hr and returns by increasing his speed by 40%.
FORMULA USED:
Average speed = 2XY/(X + Y)
CALCULATION:
X = 60 kmph, Y = 60 × 1.4 = 84 kmph
So,
Average speed = (2 × 60 × 84)/144 = 70 kmph