A man travels 600 km by train at 80 km/hr, 800 km by ship at 40 km/hr, 500 km by aeroplane at 400 km/hr and 100 km by car at 50 km/hr. What is the average speed for the entire distance :
A. $${\text{60 km/hr}}$$
B. $$60\frac{5}{123}{\text{ km/hr}}$$
C. $${\text{62 km/hr}}$$
D. $$65\frac{5}{123}{\text{ km/hr}}$$
Answer: Option D
Solution(By Examveda Team)
Total distance travelled := (600 + 800 + 500 + 100) km
= 2000 km
Total time taken :
$$\eqalign{ & = \left( {\frac{{600}}{{80}} + \frac{{800}}{{40}} + \frac{{500}}{{400}} + \frac{{100}}{{50}}} \right){\text{ hrs}} \cr & = \frac{{123}}{4}{\text{ hrs}} \cr} $$
∴ Average speed :
$$\eqalign{ & = \left( {2000 \times \frac{4}{{123}}} \right){\text{ km/hr}} \cr & = \left( {\frac{{8000}}{{123}}} \right){\text{ km/hr}} \cr & = 65\frac{5}{{123}}{\text{ km/hr}} \cr} $$
Related Questions on Speed Time and Distance
A. 48 min.
B. 60 min.
C. 42 min.
D. 62 min.
E. 66 min.
A. 262.4 km
B. 260 km
C. 283.33 km
D. 275 km
E. None of these
A. 4 hours
B. 4 hours 30 min.
C. 4 hours 45 min.
D. 5 hours
Join The Discussion