Correct Answer - Option 1 : 140 km

**GIVEN:**

Speed when 12 min late = 60 km/h

Speed when 8 min early = 70 km/h

**FORMULA USED:**

Speed = Distance/Time

**CALCULATION:**

Let the distance be x km.

Time taken at 60 km/h = x/60 × 60 = x minutes

Time taken at 70 km/h = x/70 × 60 = 6x/7 minutes

A.T.Q

x - 12 = 6x/7 + 8

7x - 84 = 6x + 56

x = 140 km

**∴ The distance is 140 km**

**ALTERNATE SOLUTION:**

Distance = [(speed1 × speed2)/Difference in speeds] × time saved

Time saved = 12 + 8 = 20 min =1/3 hr

∴ D = [(60 × 70)/10] × 1/3

D = 140 km

∴ The distance is 140 km