Question

Q1) An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours.To cover the same distance in 1(2/3) hours, it must travel at a speed of;
A)300kmph
B)360kmph
C)600kmph
D)720kmph

Explain how you got the answer

Answer 1

Answer:

D) 720 kmph

Explanation:

First, let's find what distance this aeroplane covered. Distance (d) is the product of speed and time - here, we have a speed of 240 kmph and a time of 5 hours, gives us

$d=240\cdot5=1200$ km

Using that same fact, we can set up a new equation to solve for speed (s) when we have a distance of 1200 km and a time of 1 2/3 hours. For the sake of cleanliness, I'm gonna rewrite 1 2/3 as the improper fraction 5/3:

$1200=(5/3)s$

Multiplying both sides of the equation by 3/5:

$s=(3/5)(1200)=720$ kmph

So our answer is D.