Question

A ship can cover a certain distance in 10 hours at a speed of 16 nautical miles per hour. By how much should its speed be increased so that it takes only 8 hours to cover the same distance? (A nautical miles is a unit of measurement used at sea distance or sea water I. e. 1852metres )

Answer 1

distance=speed×time,
distance 16×10 =160nm
speed =160÷8

20nm/hr speed is needed
answer 20-16= 4nm/hr speed to be increase

Answer 2

Answer:

4 nautical miles per hour.

Step-by-step explanation:

Time = 10 hours

Speed = 16 nautical miles per hour.

$Distance = Speed \times Time$

So, $Distance = 16 \times 10$

$Distance = 160$

Now we are supposed to find  By how much should its speed be increased so that it takes only 8 hours to cover the same distance

Time = 8 hours

Distance = 160 miles

$Speed = \frac{Distance}{Time}$

$Speed = \frac{160}{8}$

$Speed =20$

Increase in speed = New speed - initial speed = 20 - 16 = 4 nautical miles per hour.

Hence  its speed  should be increased by 4 nautical miles per hour so that it takes only 8 hours to cover the same distance.