Q. WHEN THE SPEED OF A MONORAIL IS 60KM/HR IT REACHES ON TIME . IF THE SPEED IS INCREASED BY 20 KMS IT REACHES ONE HOUR REALIER THEN HOW MUCH DISTANCE DOES THE MONORAIL COVER?; Option; A) 240KMS; B) 250KMS; C) 260KMS; D) 270KMS
Answers
ANSWER IS A) 240 KMS
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Answer:
The correct answer is 240 KMS
Step-by-step explanation:
We know that velocity = distance / time
When the velocity is 60 km/hr, then substituting the value in the relation of velocity which gives us distance d = 60*t
When the speed is increased by 20 km/hr then the overall speed becomes 80 km/hr but the time tends to reduce by 1 hr
80= d/(t-1)
80*t - 80= d
Substituting the values
60*t= 80*t - 80
20*t= 80
t= 4 hrs
Now in the time of 4 hours; d = 60*t
distance = 60*4 = 240 kms