Answer :

Sure, let's break down the problem step-by-step:

1. Identify the fastest rowing speed: In our problem, we assume a reference value for the fastest rowing speed. Let's denote this speed as [tex]\( v \)[/tex].

2. Calculate 1.5 times the fastest rowing speed: We need to find [tex]\( 1.5 \times v \)[/tex].

3. Determine the result without doing any explicit calculation:
- If the fastest rowing speed is represented by [tex]\( v \)[/tex], 1.5 times this speed will consequently be [tex]\( 1.5 \times v \)[/tex].

- For example, if [tex]\( v \)[/tex] were 1 (just to illustrate):
[tex]\[ 1.5 \times 1 = 1.5 \][/tex]

- The result, 1.5 times the fastest rowing speed, will be 1.5.

4. Decimal places: The answer is [tex]\( 1.5 \)[/tex], which has one decimal place.

Thus, 1.5 times the fastest rowing speed is [tex]\( 1.5 \)[/tex] and the result has one decimal place.