Question

Q. Nagma runs around a rectangular park 180m long and 120m wide at the rate of 7.5km/hour. In how much time will she complete five rounds?​

Answer 1

Answer:

$4 \: hours \: \: (answer)$

Step-by-step explanation:

$for \: one \: completing\: round \: \: \: \: \: \\ length \: covered \: = \: 2(l + b) \\ = 2(180 + 120) \\ = 2 \times 300 \\ = 600 \: m \\ \\ therefore \: for \: completing \: five \: rounds \: \\ required \: distance \: covered \: = \: 5 \times 600 \\ = 30000 \: m = \frac{30000}{1000} = 30 \: km \\ \\ \\ time \: taken \: = \: \frac{distance}{speed} \\ = \frac{30}{7.5} \\ \\ = \frac{300}{75} \\ \\ = \frac{60}{15} \\ \\ = 4 \: hours \: \: (answer)$