Question

Which of the following is the smallest odd composite number (a) 5 (b) 21 (c)9 (d)15​

Answer 1

Answer:

A

Step-by-step explanation:

hope it will helpful to you

Answer 2

Step-by-step explanation:

Given :-

Time taken by the boat = 8 min 15 sec

Number of crossings in a day = 15 crossings

To Find :-

For how long did it travel throughout the day.

Analysis :-

Firstly find the time taken in one travel by substituting the given values from the question using it's respective formula.

In order to find for how long did it travel throughout the day multiply time taken in one travel and number of crossing.

Solution :-

We know that,

t = Time

d = Distance

s = Speed

Using the formula,

$\underline{\boxed{\sf Time \ taken \ in \ each \ travel=Time \times Crossing}}$

Given that,

Time (t) = 8 min 15 sec = 495 sec

Crossing = 15

Substituting their values,

⇒ 495 × 15

⇒ 7425 sec

According to the question,

$\underline{\boxed{\sf Time \ travelled \ each \ day=Total \ time \times Crossing }}$

Given that,

Time (t) = 7425 sec

Crossing = 15

Substituting their values,

⇒ 7425 × 15

⇒ 111375 sec = 123 min 45 sec

⇒ 2 hour, 3 min, 45 sec

Therefore, the boat travels 2 hour, 3 min, 45 sec throughout the day.