a) 4 seconds
b) 7 seconds
c) 12 seconds
d) 14 seconds
Answer: d
Explanation: Speed = $$\left( {90 \times \frac{5}{{18}}} \right)$$ m/sec = 25 m/sec
Total distance covered = (120 + 230) m
= 350 m
Required time
= $$\frac{{350}}{{25}}$$ seconds
= 14 seconds
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