An insect can walk in both forward and reverse directions. He walks forward for 3 minutes and then reverse for 2 minutes. He walks at the speed of 5 meters per minute. In what minimum time will he be able to cover 105 metres?
Explanation:
In one 5-minute cycle, the insect walks 15m forward and 10m reverse, yielding a net progress of 5m per cycle. After 18 cycles (90 minutes), it has advanced 90m. In the next 3 minutes, it walks continuously forward at 5m/min, covering 15m. 90m + 15m = 105m. Total time = 90 + 3 = 93 minutes.
I am standing in the middle of a park. I am facing east. My friend Sohan is looking towards south-west. Mohan is facing north-west and Raju is facing north-east. Now each of us turns 90° clockwise. Where am I looking now?
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