What was Devi's average speed?

6 x 40/60 = 4

7 - 4 = 3

3 x 60/40 = 4.5 km/h or 3/4 x 6 = 4.5 km/h

Alternative method

----------------------

7 ÷ 40/60 = 7 x 60/40 = 10.5

**Combined speed**

10.5 - 6 = 4.5 km/h

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## Monday, January 3, 2011

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Speed PSLE 2010 P1 Q27

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Chun and Devi started jogging from the same place in opposite directions along a straight path. They jogged for 40 minutes. At the end of the jog, they were 7 km apart. Chun's average speed was 6 km/h.

What was Devi's average speed?

6 x 40/60 = 4

7 - 4 = 3

3 x 60/40 = 4.5 km/h or 3/4 x 6 = 4.5 km/h

Alternative method

----------------------

7 ÷ 40/60 = 7 x 60/40 = 10.5**Combined speed**

10.5 - 6 = 4.5 km/h

What was Devi's average speed?

6 x 40/60 = 4

7 - 4 = 3

3 x 60/40 = 4.5 km/h or 3/4 x 6 = 4.5 km/h

Alternative method

----------------------

7 ÷ 40/60 = 7 x 60/40 = 10.5

10.5 - 6 = 4.5 km/h

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As appeared in PSLE 2010 exam:

ReplyDeleteChun and Devi started jogging from the same place in opposite directions along a straight path. They jogged for 40 minutes. At the end of the jog, they were 7 km apart. Chun's average speed was 6 km/h.

What was Devi's average speed?

I don't get it. Why do you take "7-4=3"?

ReplyDeleteChun jogged at 6 km/h for 40 min, so the distance he covered was 4 km.

ReplyDeleteSince, they were 7 km apart, Devi jogged 7 - 4 = 3 km.

Sorry but i still do not get it.

ReplyDelete