25 people can dig the hole of 50 m deep in [tex] 1.2 [/tex] hours
Explanation
4 people can dig a hole 20 m deep in 3 hours
So, 1 people can dig a hole 20 m deep in (3×4)hours= 12 hours [If the number of people decreases, then the time taken to dig the hole will increase]
and 1 people can dig a hole 1 m deep in ([tex] \frac{12}{20} [/tex])hours = [tex] \frac{3}{5} [/tex] hours = 0.6 hours
Now, if 1 people dig the hole of 50 m , then the time needed = (0.6×50) hours = 30 hours
So, 25 people can dig the hole of 50 m deep in = [tex] \frac{30}{25}= \frac{6}{5}= 1.2 [/tex] hours
