Question

Travelling at a constant speed of 45 km/h, how long will a motorcycle take to make 12 laps around a rectangular track 800 m long and 400 m wide?

Answer 1

Speed of the motor cycle = 45 km/h

=$\frac{45 × 1000\: m}{60 × 60 \:s}$

= 12.5 m/s
time taken = ?

Distance travelled = Perimeter of the rectangular track
=> 2( l + b )
=> 2( 800 + 400 )
=> 2 × 1200
=> 2400 m

Similarly,
speed = $\frac{distance}{time}$

=> 12.5 = $\frac{2400}{t}$

=> t = $\frac{2400}{12.5}$

=> t = 192 s = 3.2 min

Answer 2

Answer:

Speed of the motor cycle = 45 km/h

=\frac{45 × 1000\: m}{60 × 60 \:s}

60×60s

45×1000m

= 12.5 m/s

time taken = ?

Distance travelled = Perimeter of the rectangular track

=> 2( l + b )

=> 2( 800 + 400 )

=> 2 × 1200

=> 2400 m

Similarly,

speed = \frac{distance}{time}

time

distance

=> 12.5 = \frac{2400}{t}

t

2400

=> t = \frac{2400}{12.5}

12.5

2400

=> t = 192 s = 3.2 min

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