Time speed distance relationships – UGC NET Question

A is correct because time = distance/speed for fixed distance, so time varies inversely with speed. C is true since distance = speed × time at constant speed. D is true because halving speed doubles time for the same distance. B is false because doubling speed at the same time doubles distance, not halves it. E is false; starting time is not forced by speed alone. Therefore A, C and D only are correct.

Option A:
Option A is correct as it captures both inverse and direct proportion relationships along with a key consequence for halving speed.

Option B:
Option B is incomplete because it excludes D, missing an explicit and important inverse-proportion consequence.

Option C:
Option C is wrong since it includes B, which misstates the effect of doubling speed at fixed time.

Option D:
Option D is incorrect because it adds E (false) and omits A (true), so it cannot be correct.