The speed of two insects equal the same speed when rounded to the nearest whole number; dragonfly: 6.974 ; horsefly: 3.934 ; bumblebee: 2.861 ; honeybee: 2.548; housefly: 1.917

Am presuming you are looking for the two insects.

In rounding up to nearest whole number, you look at the number before the decimal point, if the number after that is 5 or more, you add up one extra to the digit before the decimal point.

When you round up bumblebee 2.861 to the nearest whole number you have 3.

When you round up honeybee 2.548 to the nearest whole number you have 3.

The two insects are bumblebee and honeybee.

No other two are equal when rounded up to the nearest whole number.

Dragonfly= 7
horsefly= 4
bumblebee= 3
honeybee= 3
housefly= 2
Dragonfly is the fastest with a speed of 7.