Paper 1 · Mathematical Reasoning and Aptitude
UGC NET December 2023 (11.12.2023) Shift-II
A salesman travels from Delhi to Ambala at 30 km/h and returns at 90 km/h. If the total time taken is 8 hours, find the total distance covered by him.
A480 km
B240 km
C360 km ✓ Correct
D280 km
Correct answer: (C) 360 km — The total distance covered is 360 km, so that is the answer.
Explanation
★The total distance covered is 360 km, so that is the answer.
★The salesman goes one way at 30 km/h and returns at 90 km/h.
★The average speed for the whole trip is twice the product over the sum of the speeds.
★That is 2 times 30 times 90 divided by 120, which is 45 km/h.
★Over 8 hours at 45 km/h the total distance is 45 times 8.
★This equals 360 km.
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