Question

A race car is driven by a professional driver at 99 . What is this speed in and ? 1 mile = 1.61 kilometers 1 hour = 60 minutes Express the answers to the correct number of significant figures. The speed is equivalent to_____ kilometers /hour , or________ kilometers /minutes .

Answer 1

Answer:

Speed of the car is equivalent to 159.39 KM/hour or 2.6565 Km/min.

Step-by-step explanation:

The speed of the car is given as  99 mi/hour.

Now, WE know that 1 Mile = 1.61 KM

Hence, in order to calculate the speed of the car in KM/hour we will multiply the speed of the car in miles with 1.61.

⇒The speed of the car in KM/hour = 99 × 1.61 KM = 159.39 KM/hour

Also, 1 hour = 60 minutes

⇒ Speed of the car in KM/min = (159.39) ÷ 60 = 2.6565 K/min

Answer 2

Let us assume that the given speed is in miles per hour.

A race car is driven by a professional driver at 99 mph.

We have to find the speed in kilometer per hour and kilometer per minutes

As 1 mile = 1.61 km

So, 99 miles = $99\times1.61=159.39$ kmph

1 km per hour = 0.0166 km per minute

So, 159.39 kmph = $159.39\times0.0166=2.6458$ km per minute

Hence, The speed is equivalent to 159.39 kilometers /hour, or 2.645 kilometers/minutes .