Question

a car travels 200 km in 5 hours i. how long will it take to travel 400 km? ii. how far will it travel in 7.5 hour

Answer 1

Speed of car = 200/5 = 40km/h

Time to cover 400km = 400/40/h =  10hour

Distance covered in 7.5hr = 40km/h x 7.5h = 300km

Answer 2

d1=200km(Distance he travelled the first time)

t1=5hrs( he took to complete the distance of 200km)

s1=?(his speed during travelling the distance of 200km)

we know,
speed=distance/time
=>s1= 40km/hr

Now, d2=400km(distance he covered the second time)

t2=?( the time he takes to complete the distance of 400km)

s2=s1=40km/hr(the speed will remain same throughout)

therefore,
time=distance/speed
=>t2=10hrs

t3=7.5hrs
d3=?
s1=s2=s3=40km/hr
so,
distance=speed×time
d3= 7.5×40
= 300km