Question

A cyclist covers a distance of 750 m in 2 min 30 sec. What is the speed in km/hr of the cyclist?

Answer 1

As speed =distance/time therefore

distance covered by cyclist = 750 m

time taken = 2min 30sec =150 sec

we know,

speed = distance/time

= 750 m/150 sec

= 5 m/sec

we know,

m/s change to km/h when 18/5 multiply with m/s

so, speed = 5m/s = 5× 18/5 = 18 km/h

Answer 2

$\Large \underline{ \mathfrak{Answer : }} \\ \\ \sf Option \: C. \\ \\ \Large \underline{ \mathfrak{Solution : }} \\ \\ \boxed{ \rm Speed = \frac{Distance}{Time}} \\ \rm Distance = 750 \: meter \\ \rm Time = \text{2 min 30 sec} \\ \: \: \: \: \: \: \: \: \: \: \ \rm= 150 \: sec \\ \\ \rm Speed : \\ \qquad \sf= \frac{750}{150} \\ \qquad \sf= 5 \: m/sec \\ \\ \text{To Change m/s into km/h, } \\ \text{We have to multiply from} \rm \dfrac{18}{5}. \\ \\ \rm\implies 5 \times \frac{18}{5} \: km/hr \\ \implies \large \boxed{ \rm 18 \: km/hr}$