Paper 1 · Mathematical Reasoning and Aptitude
UGC NET June 2024 Re-Exam (03.09.2024) Shift-I
If a person travels by car at 36 km/hr, he reaches his destination on time. He covers half the journey in 4/5 of the time. What speed should he maintain for the remaining part to reach on time?
A80 km/hr
B75 km/hr
C90 km/hr ✓ Correct
D85 km/hr
Correct answer: (C) 90 km/hr — The required speed is 90 km/hr, so that is the answer.
Explanation
★The required speed is 90 km/hr, so that is the answer.
★At 36 km/hr the total time to cover distance d is d over 36.
★Half the journey takes four-fifths of that time.
★So only one-fifth of the time remains for the second half.
★Speed is half distance over the remaining time, which works out to 90.
★Hence 90 km/hr is correct.
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