Question

A train travels 92.4 km/hr. How many meters will it travel in 10 minutes?
A) 15400
B) 1540
C) 154
D) 15.40

Answer 1

Hint: The formula speed = distance ÷ time can be rearranged, just like any other equation.
The formula can be rearranged in three ways:

Speed = distance ÷ time ……………………. (1)
Distance = speed × time……………………. (2)
Time = distance ÷ speed……………………. (3)

To calculate one of the variables (speed, distance or time) we need the other two.
Conversion of Km to m
1 km = 1000 m……………………. (4)

Conversion of hr to minutes
1 hr = 60 min……………………. (5)

Complete step-by-step answer:
Speed of the train = 92.4 km/hr
Let’s calculate in m/min (Using equation (4) and (5)
Speed = \[\dfrac{{92.4{\rm X}1000}}{{60}} = \dfrac{{92400}}{{60}} = \dfrac{{9240}}{6} = 1540m/\min \]
Time = 10 min
By using equation (2)
$Distance = 1540{\rm X}10 = 15400m$

So, the correct answer is “Option A”.

Note: Whenever you are converting the speed from one to unit to another then make sure you are converting both units of speed. As speed always has two units.