Meena rides 12 km north, then turns to her left and rides 10 km. Neena rides 22 km west, then turns north and rides 8 km, then turns east and rides 5 km, then turns to her left and rides 4 km. Where is Meena now with respect to Neena? MCQ with Answer and Explanation
Meena rides 12 km north, then turns to her left and rides 10 km. Neena rides 22 km west, then turns north and rides 8 km, then turns east and rides 5 km, then turns to her left and rides 4 km. Where is Meena now with respect to Neena?
A. 7 km east
B. 7 km west
C. 20 km west
D. 20 km east
Answer: Option A
Solution (By JKSSB Mock Tests)
Meena's coordinates: (0, 12) -> (-10, 12). Neena's coordinates: (-22, 0) -> (-22, 8) -> (-17, 8) -> (-17, 12). Meena is at x = -10, Neena is at x = -17. Meena is 7 km East of Neena.
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.
Explanation:
Assume they sit around a table facing the centre. X faces west (sits east). X's left is south, so Y sits south facing north. Remaining positions: west and north. V is right of Z, so Z sits west (facing east) and V sits north (facing south). Hence V faces south.
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