Arun left for city A from city B at 7.20 a.m. She travelled at the speed of 90 km/hr for 2 hours 20 minutes. After that the speed was reduced to 70 km/hr. If the distance between two cities is 350 kms, at what time did Arun reach city A?
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11.20 a.m
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11.40 a.m
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10.20 a.m
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10.40 a.m
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12.20 a.m
B
Correct answer
Explanation
Distance covered at 90 km/hr for 2 hours 20 minutes (2 1/3 hours) = 90 × 7/3 = 210 km. Remaining distance = 350 - 210 = 140 km. At 70 km/hr, time needed = 140/70 = 2 hours. Total time = 2 hours 20 minutes + 2 hours = 4 hours 20 minutes. Starting at 7:20 a.m., arrival time = 7:20 + 4:20 = 11:40 a.m.