Question

The distance to nearest 100000km from earth to moon is given as 400000km. The Average speed to nearest 500km/h of rocket to moon is given as 3500km/hr. Calculate the greatest and least time taken for rocket to reach moon

Answer 1

$i ) Nearest \: distance \: from \: earth \:to \\moon = 100000 \: km$

$Average \: speed \: of \: the \: rocket = 500 \: km/h$

$Time \: taken \: reach \: moon \:(t_{1}) \\= \frac{Distance}{speed}\\= \frac{100000}{500} \\= 200 \: hr \: --(1)$

$ii ) Greatest \: distance \: from \: earth \:to \\moon = 400000 \: km$

$Average \: speed \: of \: the \: rocket = 3500 \: km/h$

$Time \: taken \: reach \: moon \:(t_{2}) \\= \frac{Distance}{speed}\\= \frac{400000}{3500} \\= \frac{80}{7} \\= 11\frac{3}{7}\: hr \: --(2)$

Therefore.,

$\red{ Greatest \:time\:to \: reach \: moon }\\ \green { = 200\: hr}$

$\red{ Least \:time\: reach \: moon } \\\green { = 11\frac{3}{7}\: hr }$

♪••.