(3) Time taken in going on foot and came running = 6 hours 50 minutes .... (i) 2 × time taken to run one way= 8 hours 30 minutes.... (ii) Equation (i) × 2 – (ii), 2 × time taken to run one way= 13 hours 40 minutes – 8 hours 30 minutes = 5 hours 10 minutes