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? MCQ with Answer and Explanation
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?
A. 100 minutes
B. 96 minutes
C. 93 minutes
D. 105 minutes
Answer: Option C
Solution (By JKSSB Mock Tests)
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.
Amit traveled 15 km in a car, then took a left turn and traveled 5 km, then took a left turn and traveled 15 km. If he is now facing east, how far is he now from the starting point?
Explanation:
If two left turns (180° rotation) put him facing East, he must have started facing West. Path: 15km West, 5km South (left turn), 15km East (left turn). His final position is exactly 5km South of his starting point.
A girl is facing south-east. She turns 900 degrees clockwise, then turns left, then right once, then right once, then 45 degrees clockwise, and then 135 degrees counterclockwise, and then 45 degrees clockwise. Lastly, in which direction is he facing?
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