Is there any Short cut??A boat traveled upstream 90 miles at an average speed of (v-3) miles per hour and then traveled the same distance downstream at an average speed of (v+3) miles per hour. If the trip upstream took a half hour longer than the trip do : Crackverbal Support

A boat traveled upstream 90 miles at an average speed of (v-3) miles per hour and then traveled the same distance downstream at an average speed of (v+3) miles per hour. If the trip upstream took a half hour longer(Is there any short cut??) Print

Modified on: Tue, 12 Oct, 2021 at 12:08 PM

CONCEPT: The question uses the application of Speed Time Concepts with Relative Speed as a major area of focus here.

The distance downstream is 90 miles and upstream too is 90 miles.

Hence if we divide 90 by 2.5 and 90 by 3(1/2 an hour more than 2.5) we have integer values of 36 and 30 mph respectively and we can choose that option.(A here)

Every other option(including the 1/2 hour addition) will lead to decimal values and it is relatively a safer option to go for under a time crunch.

Hope this helps.

Did you find it helpful? Yes No

A boat traveled upstream 90 miles at an average speed of (v-3) miles per hour and then traveled the same distance downstream at an average speed of (v+3) miles per hour. If the trip upstream took a half hour longer(Is there any short cut??) Print

Related Articles