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 mile in a unit of measurement used at sea distance or sea wateri.c.
1852 metres).
​

Answer 1

Answer:

4 nautical miles per hour.

Step-by-step explanation:

Time = 10 hours

Speed = 16 nautical miles per hour.

Distance = Speed \times TimeDistance=Speed×Time

So, Distance = 16 \times 10Distance=16×10

Distance = 160Distance=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=

Time

Distance

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

8

160

Speed =20Speed=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.