Question

Rahul drives for 2 hours at a constant speed of 75 km/h. He then drives the next 3 hours at 90 km/h after which
he further increases his speed to 100 km/h. How much time he will take to reach his destination 500 km away?
​

Answer 1

Step-by-step explanation:

1st 2 hours :-

speed=75km/hr

time= 2hrs

dist = 75*2 = 150km

2nd 3hours :-

speed=90km/hr

time =3 hr

dist. = 90*3= 270km

total dist travelled till 5 hours is 270km + 150km = 420km

so out of 500km, 420km is already travelled remaining dist. is 500 - 420 = 80km

this 80 km will be travelled at 100km/hr

speed = 100km/hr

dist=80km

time = dist. = 80 hr = 0.8 hr = 8 *60 = 48 mins.

speed. 100. 10

Total time taken to travel the 500km dist = 2hr+ 3hr+48mins = 5hrs 48 mins ( Ans)

Answer 2

Answer:

5hrs 48 minutes

Step-by-step explanation:

(1) Speed= 75km/hr

time=2hrs

distance= s×t

= 75×2= 150km

(2) s=90km/h

t= 3hrs

d= 90×3= 270km

total distance= 500km

Remainingdistance= 500-(150+270)= 80km

speed= 100km/h

but we need only 80 so we should divide (60÷100)×80

= 48 min

hence total time taken= 2+3+0.48= 5hrs 48 minutes