Question

A plane travels at a speed 212 mph
by rounding 212 to 1 significant figure and using your answer work out an estimate for the number of seconds the plane takes to 1 mile

Answer 1

Answer:

0.58 miles per second is the answer to this question

Answer 2

Answer:

The number of seconds. i.e., time taken by the plane takes to $1mile$ = $18seconds$.

Step-by-step explanation:

Given,

The speed of the plane = $212mph$

The distance for the plane to take off = $1mile$

The number of seconds, i.e., time taken by the plane takes to $1mile$ =?

As given, round off the speed to 1 significant figure.

• Speed = $212mph$

By rounding off to 1 significant figure:

• Speed = $200mph$

Now convert mph ( mile per hour ) into mps ( mile per second )

• $1 hour$ = $3600 sec$

Therefore,

• $200mph$ = $\frac{200}{3600} mps$ = $\frac{1}{18}mps$

Now, as we know,

• Speed = $\frac{Distance}{time}$
• Time = $\frac{Distance}{speed}$ = $\frac{1}{\frac{1}{18} }$ = $18seconds$

Hence, the number of seconds, i.e., time taken by the plane takes to $1mile$ = $18seconds$.