(c) 240 km
Distance covered by goods train before express train leaves = 40 × 2 = 80 km
Relative speed = (60 – 40) km/hr = 20 km/hr
∴ Time taken to cross each other = \(\frac{80}{20}\) hrs = 4 hrs
∴ Distance from Delhi where the express train is expected to overtake the goods train = (4 × 60) km = 240 km.