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Aman travelled at a speed of 20 m/min for 100 min, and at a speed of 70 m/min for 50 min. His average speed is:
Question

Aman travelled at a speed of 20 m/min for 100 min, and at a speed of 70 m/min for 50 min. His average speed is:

A.

25 m/min

B.

35 m/min

C.

1103\frac{110}{3}​ m/min

D.

703\frac{70}{3} ​m/min

Correct option is C

Given:
Speed 1 = 20 m/min, Time 1 = 100 min
Speed 2 = 70 m/min, Time 2 = 50 min
Formula Used:
Distance = Speed × Time
Average Speed = Total DistanceTotal Time\frac{\text{Total Distance}}{\text{Total Time}}​​
Solution:
Distance 1 = 20 × 100 = 2000 m
Distance 2 = 70 × 50 = 3500 m
Total Distance = 2000 + 3500 = 5500 m
Total Time = 100 + 50 = 150 min
Now,
Average Speed = 5500150=1103 m/min. \frac{5500}{150} = \bf \frac{110}{3}\, m/min.​​

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