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David sat beside an empty artificial pond.  At 11:15 am, the pond began to fill up.     The water rose 12.5 cm every 30 minutes.  At what time will the water level reach     2.5 metres?  Show your work and explain your strategy.

 May 18, 2020
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David sat beside an empty artificial pond.  At 11:15 am, the pond began to fill up.     The water rose 12.5 cm every 30 minutes.  At what time will the water level reach     2.5 metres?  Show your work and explain your strategy.

 

2.5 meters  x  100 cm =250 cm

250 cm / 12.5 cm =20 30-minute periods to reach 2.5-meter level.

20 / 2 = 10 hours to reach 2.5-meter level.

11:15 am  +  10 hours =21.15 hours  - 12 hours =9:15 pm - when the pond level will reach 2.5 meters

 May 18, 2020

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