The speed differential between two trains is 7:8. If the second train travels 400 kilometres in four hours, the first train's speed is:
A. 70 km/hr
B. 75 km/hr
C. 84 km/hr
D. 87.5 km/hr
Answer:D
The speed differential between two trains is 7:8. If the second train travels 400 kilometres in four hours, the first train's speed is:
A. 70 km/hr B. 75 km/hr C. 84 km/hr D. 87.5 km/hr