VTMO 2016 — Grade 7 — semifinal Question 7

Question 7

A car must average $48 \frac{\,\mathrm{km}}{h}$ over its trip. The first half-distance is traveled at $40 \frac{\,\mathrm{km}}{h}$. What minimum speed is needed for the second half?

$50$
$55$
$60$
$65$
$70$