Question

The odometer of a car reads 1800 km at the start of a trip and 2400 km at the end of the trip took 10 hours.Calculate the average speed of the car in km/h-1 and ms-1.

Answer 1

Average speed=$\frac{Total distance}{Total time}$
                        
Initial reading=1800
final reading=2400

total distance= Final reading -initial reading  = 2400-1800 = 600 km
total time= 10 hrs

Average speed=$\frac{600}{10}$
                        = 60 km/hr

CONVERTING km/hr TO m/s  
To convert km/hr to m/s just multiply by 5/18

60×$\frac{5}{18}$
   
=16.66 m/s

Answer 2

distance covered by the car
$s = 2400 - 2000 \: km \: = 400 \: km \: \\ time \: elapsed \: t \: = 8 \: h \: \\ average \: speed \: of \: car \: is \: \\ v \: av \: = \frac{s}{t} \: = \frac{400}{8h} \: km \: \\ 50 \: k m \: {h}^{ - 1} \\ 50 \: \frac{km}{h} \times \frac{1000}{1 \: km} \times \frac{1 \: km}{36 00 \: s } \\ = 13.9 \: {ms}^{ - 1} \: the \: average \: speed \ \\ of \: car \: is \: 50 \: km \: {h}^{ - 1} \: or \: 13.9 \: {ms}^{ - 1}$
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