Ravi is attending an interview at Kochi which is 400 km from his home. He plans to leave home at 7.00 AM and drive at 100 km/hr so that he reaches for the interview scheduled at 11.00 AM on time. Ravi drives at that speed of 100 km/hr for the first 200 km, but due to the bad road, he is forced to slow to 40 km/hr for 40 km. The least speed needed for the rest of the trip to arriving in time for the interview is

• A. 100 km/hr
• B. 180 km/hr
• C. 160 km/hr
• D. 140 km/hr