a) 4 hours
b) 3 hours
c) 2 hours
d) 1 hours
Answer: c
Explanation: Let the original speed be S then,
Total time taken,
$$ {\frac{{36}}{{{\text{S}} – 6}}} + {\frac{{36}}{{{\text{S}} + 6}}} $$ = 8 hours
On solving the equation
S = 12, -3
Then possible value of S = 12 km/h.
Thus, time taken by car at faster speed = $$\frac{{36}}{{12 + 6}}$$ = 2 hours
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