Question

a man crosses a bridge 800 m long in 8 minutes. find his speed in km/hr

Answer 1

Answer: 6km/hr

Step-by-step explanation:

Distance = 800 m = 0.8 km

Time = 8 minutes = $\frac{8}{60}$ hr

Speed = $\frac{distance}{time}$

= $\frac{0.8}{\frac{8}{60} }$

= $\frac{0.8 × 60}{8}$

= 6

∴ Speed = 6km/hr

Answer 2

Given,

The bridge length = 800m.

Time = 8mint.

To Find,

The speed of the person.

Solution,

Given that,

The person took time t = 8mint.

And he traveled 800m as the bridge is 800m long.

Since we need to find his speed in km/hr, convert time.

Therefore, time t = $\frac{8}{60}$

t = $\frac{8}{60}$hr.

And the distance = 0.8km.

We need to find speed.

Speed S= $\frac{distance}{time\\}$

S = $\frac{.8}{\frac{8}{60} }$

S = $\frac{0.8*60}{8}$

S = 6km/hr.

Hence, the person traveled at a speed of 6km/hr to cover an 800m long bridge in 8minute.