Answer:

Total time given =35 days.

To dig a canal of 2 km in 20 days, 90 men were required.

So, to dig a canal of 1 km in 1 day,

2

90×20

men will be required.

So, to dig a canal of 4 km in 15 days

15

900×4

=240 men will be required.

As 90 men were already employed, so 150 more men are required.

l hope it's help you ♥️

A contractor undertakes to dig a canal 12 km long in 30 days with 80 men. After 10 days he found that only 3 km of canal is completed. How many men must now be employed to finish the work on time?

Total time given =35 days.

To dig a canal of 2 km in 20 days, 90 men were required.

So, to dig a canal of 1 km in 1 day,

2

90×20

men will be required.

So, to dig a canal of 4 km in 15 days

15

900×4

=240 men will be required.

As 90 men were already employed, so 150 more men are required.

❥l hope u satisfying my Answer ♥️