Which number has a 3 that is 10 times as much as the 3 in 24,345 A) 44,578 B) 89,236 C) 13,847 D) 56,243

1 answer:

4 0

The 3 in 24,345 has a value of 300. A number 10 times that would have a value of 300*10 or 3,000. The 3 in choice C has a value of 3,000 so C is the right answer.

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7 0

3 years ago

A motorboat traveling with a current can go 120 km in 4 hours. Against the current, it takes 6 hours to go the same distance. Fi

charle [14.2K]

The speed of motorboat in still water is 25 km/hr and speed of current is 5 km/hr

Solution:

Given that, motorboat traveling with a current can go 120 km in 4 hours

In water, the direction along the stream is called downstream

Let us find the downstream speed

Downstream distance = 120 km

time taken in downstream = 4 hours

The speed is given by formula:

$speed = \frac{distance}{time}$

$\text{ Downstream speed } = \frac{120}{4} = 30$

Thus downstream speed = 30 kilometer per hour

Against the current, it takes 6 hours to go the same distance

The direction against the stream is called upstream

Let us find upstream speed

Upstream distance = 120 km

time taken in upstream = 6 hours

$\text{Upstream speed } = \frac{120}{6} = 20$

Thus upstream speed is 20 kilometer per hour

Formula to use:

If the speed downstream is a km/hr and the speed upstream is b km/hr, then:

$\text{Speed in still water } = \frac{1}{2}(a+b) \text{ kilometer per hour }\\\\\text{Speed of stream } = \frac{1}{2}(a-b) \text{ kilometer per hour }$