1.

Rashmi started a journey of 480 km by car. She wants to complete the journey as soon as possible for that she wants to maintain the speed of the car at 80 kmph. She maintains the speed for 62.5% of distance and after that, she took a break for 30 mins. and then starts the journey with 60 kmph. What is the difference between the actual time taken and the planned time for the entire journey?1). 45 min2). 75 min3). 120 min4). 90 min

Answer»

Total journey distance = 480 km

Ideal average speed = 80 kmph

Planned or time taken in ideal condition = 480/80 = 6 hour = 360 minutes

For actual time,

Distance in which average speed of 80 kmph is maintained,

Distance covered before break = 62.5% of 480 = (5/8) × 480 = 300 km

Time taken to COVER this distance = 300/80 = 3.75 hour = 225 minutes

After the break,

Distance need to be covered = 480 - 300 = 180 km

Time required to cover the distance = 180/60 = 3 hour = 180 minutes

Actual time of journey = 225 + 180 + 30 = 435 minutes

DIFFERENCE in time = 435 - 360 = 75 min


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