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The question below is from previous year CAT question from CAT 2018 exam comes from CAT Arithmetic – TSD – Points A and B are 150 km apart…. Find out by answering this question which tests an aspirant’s Quantitative Ability Skills:
Time taken to cover first 50 km at 100 km/hr = 1/2 hr.
Time taken to cover second 50 km at 50 km/hr = 1 hr. Time taken to cover last 50 km at 25 km/hr = 2 hr.
When car 2 starts, car 1 has already covered 20 km.
So, time taken by car 1 to reach B after car 1 starts = total time – time required to travel first 20 km
= 3 hr 30 min – 12 min = 3 hr 18 min
Distance travelled by car 1 = (50 + 50 + 45) = 145 km Distance from B = (150 – 145) km = 5 km
Hence, 5 is the correct answer.