Management Aptitude Test 2015 Paper

(a) ∵ Speed on Monday = 60 km/h
and distance covered = 70 km
Time = $\frac{70}{60}=\frac{7}{6}$h
Average speed of Monday, Wednesday and Friday
= $\frac{\mathrm{Total}\mathrm{distance}}{\mathrm{Total}\mathrm{time}\mathrm{taken}}$
= $\frac{210}{3\times \frac{7}{6}}=\frac{210\times 2}{7}$ = 60 km/h
Average speed on Tuesday and Thursday
= $\frac{\mathrm{Total}\mathrm{distance}}{\mathrm{Total}\mathrm{time}\mathrm{taken}}$
= $\frac{140\times 5}{2\times 7}$ = 50 km/h
∴ Average speed of week = $\frac{60+50}{2}=\frac{110}{2}$ = 55 km/h