joebob

21 Questions
31 Answers

+1

945

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Absolute value

Evaluate |3m-n| if m=-8, n=4
steps would be much appreciated!

MATHEXPERTISE ●

joebob Oct 21, 2018

+1

1358

2

+205

School

Sam left his school at 3:05. He walked at a speed of 3.2 mph. 15 minutes later, Al started running after him, and he caught up with Sam 10 minutes later. What was Al’s speed?

joebob Jan 21, 2018

+2

1926

1

+205

If you walk for 1.5 hours at 3 mph, how fast should you run during the next 0.5 hours to have the average speed of 4 mph?

If you walk for 1.5 hours at 3 mph, how fast should you run during the next 0.5 hours to have the average speed of 4 mph?

joebob Dec 26, 2017

+3

1199

1

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I forgot how to do this!

If you bike for 3 hours at 10 mph and then walk for 1 hour at 2 mph, what would be your average speed?

joebob Dec 26, 2017

+3

1192

2

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I’m stuck!

Two motorcycles are traveling at speeds of 120 kilometers per hour and 90 kilometers per hour respectively. If the faster one travels for 4 hours longer than the slower one and also goes twice as far, how far did the slow one travel? read more ..

joebob Nov 25, 2017

+2

1535

2

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cooking

How much salt should Ilya add to 810g of water to make 10% solution? How much solution will he make?

hectictar ●●

joebob Nov 23, 2017

+1

1065

1

+205

can you crack these?

1. It took a boat 2 hours to reach town A going upstream. The way back was 1 hour and 20 mins. What is the speed of the boat in still water if the speed of the stream is 3 mph?

2. It took a plane 2 hours to go from Dallas to New York read more ..

joebob Nov 12, 2017

+1

3345

2

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Tricky question!

A biker’s speed is 1.5 times faster than a walker’s speed. They start moving simultaneously in the same direction from the same point and, after 1.5 hours, the distance between them is 12.5 miles. What are their speeds?

joebob Nov 4, 2017

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3485

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Please answer!

On an uphill hike, Ted climbs at a rate of 3 miles an hour. Going down, he runs at a rate of 5 miles an hour. If it takes him 40 minutes longer to climb up than run down, what is the total length of Ted's hike?

CPhill ●●●

joebob Nov 4, 2017

+4

1362

1

+205

125m on the ground corresponds to 2.5 cm on a map. What is the actual distance between two objects if they are 4.2 cm apart on the map?

125m on the ground corresponds to 2.5 cm on a map. What is the actual distance between two objects if they are 4.2 cm apart on the map?

joebob Oct 22, 2017

+205

+2

?????????????????????

joebobApr 16, 2017

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+3

7

joebobApr 16, 2017

+205

+2

7

joebobApr 13, 2017

+205

+3

-1.875

joebobApr 13, 2017

+205

+4

how long does it take you to write this?

joebobApr 12, 2017

+205

+3

3240

joebobApr 12, 2017

+205

+3

0.7187389302160822

joebobApr 12, 2017

+205

+2

sure was

joebobApr 12, 2017

+205

+3

what is it?

joebobApr 12, 2017