A monkey climbs a $21 \text{ m}$ high pole. In the first minute, he climbs $3 \text{ m}$, and in the next minute, he slips down $1 \text{ m}$. How much time will he take to reach the top?
Options:
- A: $18 \text{ min}$
- B: $19 \text{ min}$
- C: $20 \text{ min}$
- D: $21 \text{ min}$
Related Practice Questions:
- Why is copper considered highly pure and extensively used in religious rituals by Hindus today according to the historical context of natural resources?
- Which of the following regions is described by R.S. Sharma as "the most coveted and contested area" fought over by important ruling powers in northern India?
- Paper currency was not used in ancient India. In which century was paper currency finally introduced to India?
- The earliest agricultural settlements and states in ancient northern India were founded along the Himalayan foothills (the "terai" route) during which period?
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